A nice article on how to mod the hell out of gedit to make into a pretty powerful ide. Some really good plugin recommendations and some custom code. Nice job. :-)
A vim cheat sheet. Lists various commands in one page, easily searchable.
A list of plugins available for Gedit. Useful resource.
An article on tuning vim to be more like Texmate (proprietary mac text editor). Discusses code completion, plugins, and a few other cool tips.
A post on pimping Gedit to make is something like Textmate (proprietary mac editor). Includes tips on some useful plugins and how to tweak settings. Worth checking out.
An overview of various editors for Ubuntu Dapper, focusing on Ruby on Rails compatibility. Each editor is covered in a little detail with enough information to get a flavour of it. Useful.