I have personally never used Ruby, but Komodo is an absolutley fantastic IDE, I use it for pretty much everything, I suggest checking out the trial version, Its the one piece of software i didnt mind paying for, Its pretty cheap anyways, i think the personal version is $30 and its compatible with OS X/Linux and windows, and the liscence includes all of them :-D....
Btw, no, im not on commision
-kieran
:banana: