diff --git a/handlers.go b/handlers.go
index e9f430f..132a821 100644
--- a/handlers.go
+++ b/handlers.go
@@ -22,7 +22,7 @@ func registerHandler(w http.ResponseWriter, req *http.Request) {
 		return
 	}
 	
-	if ! anchoredSearch(statePath("assigned.txt"), teamid, 0) {
+	if ! anchoredSearch(statePath("teamids.txt"), teamid, 0) {
 		showPage(w, "Invalid Team ID", "I don't have a record of that team ID. Maybe you used capital letters accidentally?")
 		return
 	}
@@ -97,7 +97,7 @@ func answerHandler(w http.ResponseWriter, req *http.Request) {
 
 	// Check answer
 	needle := fmt.Sprintf("%s %s", points, answer)
-	haystack := mothPath("packages", category, "answers.txt")
+	haystack := cachePath(category, "answers.txt")
 	if ! anchoredSearch(haystack, needle, 0) {
 		showPage(w, "Wrong answer", err.Error())
 	}
@@ -109,3 +109,30 @@ func answerHandler(w http.ResponseWriter, req *http.Request) {
 	showPage(w, "Points awarded", fmt.Sprintf("%d points for %s!", points, teamid))
 }
 
+// staticHandler serves up static files.
+func rootHandler(w http.ResponseWriter, req *http.Request) {
+	if req.URL.Path == "/" {
+		showPage(
+			w,
+			"Welcome",
+			`
+			  <h2>Register your team</h2>
+			  
+			  <form action="register" action="post">
+			    Team ID: <input name="h"> <br>
+			    Team name: <input name="n">
+			    <input type="submit" value="Register">
+			  </form>
+			  
+			  <div>
+			    If someone on your team has already registered,
+			    proceed to the
+			    <a href="puzzles">puzzles overview</a>.
+			  </div>
+			`,
+		)
+		return
+	}
+	
+	http.NotFound(w, req)
+}
diff --git a/maintenance.go b/maintenance.go
index 93fca5a..c787318 100644
--- a/maintenance.go
+++ b/maintenance.go
@@ -15,36 +15,36 @@ func cacheMothball(filepath string, categoryName string) {
 // maintenance runs
 func tidy() {
 	// Skip if we've been disabled
-	if exists(statePath("disabled")) {
+	if _, err := os.Stat(statePath("disabled")); err == nil {
 		log.Print("disabled file found, suspending maintenance")
 		return
 	}
 	
 	// Skip if we've expired
-	untilspec, _ := ioutil.ReadFile(statePath("until"))
-	until, err := time.Parse(time.RFC3339, string(untilspec))
+	untilspec, err := ioutil.ReadFile(statePath("until"))
 	if err == nil {
-		if until.Before(time.Now()) {
-			log.Print("until file time reached, suspending maintenance")
-			return
+		until, err := time.Parse(time.RFC3339, string(untilspec))
+		if err != nil {
+			log.Print("Unparseable date in until file: %s", until)
+		} else {
+			if until.Before(time.Now()) {
+				log.Print("until file time reached, suspending maintenance")
+				return
+			}
 		}
 	}
 	
 	log.Print("Hello, I'm maintaining!")
 	
-	// Make sure points directories exist
-	os.Mkdir(statePath("points.tmp"), 0755)
-	os.Mkdir(statePath("points.new"), 0755)
-
 	// Get current list of categories
 	newCategories := []string{}
-	files, err := ioutil.ReadDir(mothPath("packages"))
+	files, err := ioutil.ReadDir(modulesPath())
 	if err != nil {
 		log.Printf("Error reading packages: %s", err)
 	}
 	for _, f := range files {
 		filename := f.Name()
-		filepath := mothPath("packages", filename)
+		filepath := modulesPath(filename)
 		if ! strings.HasSuffix(filename, ".mb") {
 			continue
 		}
@@ -61,7 +61,7 @@ func tidy() {
 }
 
 // maintenance is the goroutine that runs a periodic maintenance task
-func maintenance() {
+func maintenance(maintenanceInterval time.Duration) {
 	for ;; time.Sleep(maintenanceInterval) {
 		tidy()
 	}
diff --git a/mothd.go b/mothd.go
index 08e0e99..b7d2909 100644
--- a/mothd.go
+++ b/mothd.go
@@ -2,18 +2,19 @@ package main
 
 import (
 	"bufio"
+	"flag"
 	"fmt"
 	"log"
 	"net/http"
-	"io/ioutil"
 	"os"
 	"path"
 	"strings"
 	"time"
 )
 
-var basePath = "/home/neale/src/moth"
-var maintenanceInterval = 20 * time.Second
+var moduleDir string
+var stateDir string
+var cacheDir string
 var categories = []string{}
 
 // anchoredSearch looks for needle in filename,
@@ -38,25 +39,6 @@ func anchoredSearch(filename string, needle string, skip int) bool {
 	return false
 }
 
-
-func awardPoints(teamid string, category string, points int) error {
-	fn := fmt.Sprintf("%s-%s-%d", teamid, category, points)
-	tmpfn := statePath("points.tmp", fn)
-	newfn := statePath("points.new", fn)
-	
-	contents := fmt.Sprintf("%d %s %s %d\n", time.Now().Unix(), teamid, points)
-	
-	if err := ioutil.WriteFile(tmpfn, []byte(contents), 0644); err != nil {
-		return err
-	}
-	
-	if err := os.Rename(tmpfn, newfn); err != nil {
-		return err
-	}
-	
-	return nil
-}
-
 func showPage(w http.ResponseWriter, title string, body string) {
 	w.WriteHeader(http.StatusOK)
 
@@ -77,30 +59,97 @@ func showPage(w http.ResponseWriter, title string, body string) {
 	fmt.Fprintf(w, "</body></html>")
 }
 
-func mothPath(parts ...string) string {
+func modulesPath(parts ...string) string {
 	tail := path.Join(parts...)
-	return path.Join(basePath, tail)
+	return path.Join(moduleDir, tail)
 }
 
 func statePath(parts ...string) string {
 	tail := path.Join(parts...)
-	return path.Join(basePath, "state", tail)
+	return path.Join(stateDir, tail)
 }
 
-func exists(filename string) bool {
-	if _, err := os.Stat(filename); os.IsNotExist(err) {
-		return false;
+func cachePath(parts ...string) string {
+	tail := path.Join(parts...)
+	return path.Join(cacheDir, tail)
+}
+
+func setup() error {
+	// Roll over and die if directories aren't even set up
+	if _, err := os.Stat(modulesPath()); os.IsNotExist(err) {
+		return err
 	}
-	return true;
+	if _, err := os.Stat(statePath()); os.IsNotExist(err) {
+		return err
+	}
+	if _, err := os.Stat(cachePath()); os.IsNotExist(err) {
+		return err
+	}
+	
+	// Make sure points directories exist
+	os.Mkdir(statePath("points.tmp"), 0755)
+	os.Mkdir(statePath("points.new"), 0755)
+
+	// Preseed available team ids if file doesn't exist
+	if f, err := os.OpenFile(statePath("teamids.txt"), os.O_WRONLY | os.O_CREATE | os.O_EXCL, 0644); err == nil {
+		defer f.Close()
+		for i := 0; i <= 9999; i += 1 {
+			fmt.Fprintf(f, "%04d\n", i)
+		}
+	}
+	
+	return nil
+}
+
+func logRequest(handler http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		log.Printf("%s %s %s\n", r.RemoteAddr, r.Method, r.URL)
+		handler.ServeHTTP(w, r)
+	})
 }
 
 func main() {
-	log.Print("Sup")
-	go maintenance();
+	flag.StringVar(
+		&moduleDir,
+		"modules",
+		"/modules",
+		"Path where your moth modules live",
+	)
+	flag.StringVar(
+		&stateDir,
+		"state",
+		"/state",
+		"Path where state should be written",
+	)
+	flag.StringVar(
+		&cacheDir,
+		"cache",
+		"/cache",
+		"Path for ephemeral cache",
+	)
+	maintenanceInterval := flag.Duration(
+		"maint",
+		20 * time.Second,
+		"Maintenance interval",
+	)
+	listen := flag.String(
+		"listen",
+		":8080",
+		"[host]:port to bind and listen",
+	)
+	
+	if err := setup(); err != nil {
+		log.Fatal(err)
+	}
+	go maintenance(*maintenanceInterval)
+
+	http.HandleFunc("/", rootHandler)
+	http.Handle("/static/", http.FileServer(http.Dir(cacheDir)))
+
 	http.HandleFunc("/register", registerHandler)
 	http.HandleFunc("/token", tokenHandler)
 	http.HandleFunc("/answer", answerHandler)
-	log.Fatal(http.ListenAndServe(":8080", nil))
-}
 
-// docker run --rm -it -p 5880:8080 -v $HOME:$HOME:ro -w $(pwd) golang go run mothd.go
+	log.Printf("Listening on %s", *listen)
+	log.Fatal(http.ListenAndServe(*listen, logRequest(http.DefaultServeMux)))
+}
diff --git a/points.go b/points.go
index 9c3e2e2..67817e3 100644
--- a/points.go
+++ b/points.go
@@ -73,6 +73,25 @@ func pointsLog() []Award {
 	return ret
 }
 
+// awardPoints gives points points to team teamid in category category
+func awardPoints(teamid string, category string, points int) error {
+	fn := fmt.Sprintf("%s-%s-%d", teamid, category, points)
+	tmpfn := statePath("points.tmp", fn)
+	newfn := statePath("points.new", fn)
+	
+	contents := fmt.Sprintf("%d %s %s %d\n", time.Now().Unix(), teamid, points)
+	
+	if err := ioutil.WriteFile(tmpfn, []byte(contents), 0644); err != nil {
+		return err
+	}
+	
+	if err := os.Rename(tmpfn, newfn); err != nil {
+		return err
+	}
+	
+	return nil
+}
+
 // collectPoints gathers up files in points.new/ and appends their contents to points.log,
 // removing each points.new/ file as it goes.
 func collectPoints() {