Currently I'm working on an application for a client. It's build in Ruby on Rails. After using ActiveScaffold for the startup I've decided to remove this plugin and write my own Ajax table.
I found a nice article / sample about this subject: http://dev.nozav.org/rails_ajax_table.html
The article is nice for a single table, but I need multiple tables, so I need to wrap some stuff in helpers. But that shouldn't be a problem.