Hi there, I don't like TinyMCE and we're using CKEditor at the customized SS2, but I don't have module implementation.
Since SilverStripe CMS was moved to jQuery UI we decided to work on elRTE integration. I think it will be the best editor for SS.
I have attached draft elRTE module for the SS3.
Ah, also u need to comment out a line at framework/admin/code/LeftAndMain.php:
Here's some additional information about elRTE: http://elrte.org/
P.S. For some reason my old account is inaccessible so I've got to use one a new one, sorry