ruby script/plugin install git://github.com/devon/tiny_mce_plus.git

1, Install tiny_mce_plus

cd vendor/plugins
git clone git://github.com/devon/tiny_mce_plus.git

script/generate tiny_mce_plus_migration
rake db:migrate

rake tiny_mce_plus:install

2, Install dependent plugins(if you didn't):

attachment_fu （git://github.com/technoweenie/attachment_fu.git）
responds_to_parent （http://responds-to-parent.googlecode.com/svn/trunk）
will_paginate （git://github.com/mislav/will_paginate.git）

Or(because some version doesn't work properly, so, i packaged the plugins)

rake tiny_mce_plus:plugins

Also, you need 'login_required' method and 'current_user' object in your application. (I recommend you use restful_authentication).

3, In your layout:

<%= javascript_include_tiny_mce_if_used %> 
<%= tiny_mce if using_tiny_mce? %>
<%= javascript_include_tag :defaults %>

4, In your controller:

uses_tiny_mce(:options => AppConfig.default_mce_options, :only => [:new, :edit])

Install file lists
==================

rake tiny_mce_plus:install will Install following files:

app
  |-- controller
    |-- tiny_mce_photos_controller.rb
  |-- helpers
    |-- remote_link_renderer.rb
  |-- models
    |-- tiny_mce_photo.rb
  |-- views
    |-- tiny_mce_photos
       |-- _photo_list.html.erb
config
  |-- initializers
    |-- tiny_mce_plus_config.rb

public
  |-- images
    |-- tiny_mce
  |-- javascripts
    |-- tiny_mce

You may custom the config in tiny_mce_plus_config.rb.

Attention:
1, do not put around the textarea.
2, If you use old will_paginate plugin, maybe change the url_for to url_option in remote_link_renderer.rb

There is currently no advanced documentation for this plugin.