Making use of modules and putting classes under modules.

app/controllers/admin/blog/categories_controller.rb

@@ -1,7 +1,11 @@
-class Admin::Blog::CategoriesController < Admin::BaseController
+module Admin
+  module Blog
+    class CategoriesController < Admin::BaseController
 
       crudify :blog_category,
               :title_attribute => :title,
               :order => 'title ASC'
 
     end
+  end
+end

app/controllers/admin/blog/comments_controller.rb

@@ -1,4 +1,6 @@
-class Admin::Blog::CommentsController < Admin::BaseController
+module Admin
+  module Blog
+    class CommentsController < Admin::BaseController
 
       crudify :blog_comment,
               :title_attribute => :name,
@@ -34,3 +36,5 @@ class Admin::Blog::CommentsController < Admin::BaseController
       end
 
     end
+  end
+end

app/controllers/admin/blog/posts_controller.rb

@@ -1,4 +1,6 @@
-class Admin::Blog::PostsController < Admin::BaseController
+module Admin
+  module Blog
+    class PostsController < Admin::BaseController
 
       crudify :blog_post,
               :title_attribute => :title,
@@ -84,3 +86,5 @@ protected
         @blog_categories = BlogCategory.find(:all)
       end
     end
+  end
+end

app/controllers/admin/blog/settings_controller.rb

@@ -1,4 +1,6 @@
-class Admin::Blog::SettingsController < Admin::BaseController
+module Admin
+  module Blog
+    class SettingsController < Admin::BaseController
 
       def notification_recipients
         @recipients = BlogComment::Notification.recipients
@@ -37,3 +39,5 @@ class Admin::Blog::SettingsController < Admin::BaseController
       end
 
     end
+  end
+end

app/controllers/blog/categories_controller.rb

@@ -1,4 +1,5 @@
-class Blog::CategoriesController < BlogController
+module Blog
+  class CategoriesController < BlogController
 
     def show
       @category = BlogCategory.find(params[:id])
@@ -9,3 +10,4 @@ class Blog::CategoriesController < BlogController
     end
 
   end
+end

app/controllers/blog/posts_controller.rb

@@ -1,4 +1,5 @@
-class Blog::PostsController < BlogController
+module Blog
+  class PostsController < BlogController
 
     before_filter :find_all_blog_posts, :except => [:archive]
     before_filter :find_blog_post, :only => [:show, :comment, :update_nav]
@@ -99,3 +100,4 @@ protected
     end
 
   end
+end

app/mailers/blog/comment_mailer.rb

@@ -1,4 +1,5 @@
-class Blog::CommentMailer < ActionMailer::Base
+module Blog
+  class CommentMailer < ActionMailer::Base
 
     def notification(comment, request)
       subject     BlogComment::Notification.subject
@@ -9,3 +10,4 @@ class Blog::CommentMailer < ActionMailer::Base
     end
 
   end
+end