Mac\'s have TextMate as there preferred application for ruby development, but what would be the preferred application for linux? I need something where it\'s easy to work wi
Given that you use vim, this post might be interesting.
Her is the Fuzzyfinder Textmate vim plugin that the post refers to.
Setup Gedit to be almost like Textmate
If you are on Ubuntu/Debian, plain old emacs with ruby-elisp package isn't bad. It's no TextMate, but it's not bad.
I prefer Netbeans on both linux and Mac
Since you are a vimmer, have you looked at this? I have no experience with it, but looks quite good in the screencast.
The other answers are about ruby editors, so I thought I will add an answer on my linux setup.
I use Ubuntu with VM player (free) on top of windows 7. I dedicate 2 core and 2 GB to the vm. Benefit of using the VM on top of windows is that I can use linux just for development and windows for everything else. Skype, webex, and team viewer works in windows, but i find them to be flaky in linux. Also I use office once in a while, very easy on windows.