I have provided the source code of the ajax based drag drop tree in rubyonrails in one of my previous posts.
I found some of the people are getting problems to incorporate the code into their running applications so i am providing a sample rails application in which all the code for tree is already been […]

My friend sur wrote and shares his code for Ajax based drag drop sortable tree for rails. He is also trying to pluginize this, and soon it will be publicly available. Find more detail here.

There is no way to upload files using AJAX. How Gmail does it then? Well, the answer is using <iframe>. Here is a post that describe this technique in detail. Infact we are using this technique from months, obviously inspired by Gmail. ;-)
update: Technically speaking, it’s not Ajax. Just an iframe hack. You are […]

Capistrano1.2.0 cheat sheet here.
REST cheat sheet here.
Rails cheat sheet here.
Rails testing cheat sheet here.

Prototype helper method update_element_function is deprecated now, Please use RJS instead.