I installed Eclipse on my Linux VM over the weekend to see if it's useful for Ruby on Rails development. So far it is a definite improvement, compared to using no IDE at all.

After installing Eclipse Classic 3.7.1 I installed "Dynamic Languages Toolkit - Ruby Development Tools", Subversive, and "SVNKit 1.3.5".

I haven't used the Ruby language features of Eclipse much, but having a working Subversion GUI is a big advantage. I tried various Linux Subversion GUIs, but none of them actually worked, due to the fact that my Subversion server uses a self-signed certificate.

In addition to a Subversion GUI, it's just nice to have the source tree represented graphically, and the source files easily editable: