Better handling of 404s

app/controllers/users_controller.rb

@@ -4,7 +4,8 @@ class UsersController < ApplicationController
   before_filter :ensure_authenticated!, :only => [:edit, :update]
 
   def show
-    @user = User.find_by_nickname(params[:nickname])
+    @user = User.find_by_nickname!(params[:nickname])
+
     collection = @user.asciicasts.
       order("created_at DESC").
       page(params[:page]).

config/routes.rb

@@ -27,4 +27,6 @@ AsciiIo::Application.routes.draw do
   end
 
   root :to => 'home#show'
+
+  match '*a', :to => 'application#not_found'
 end