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
Aptana Studio is indeed very nice. Also Gedit does the job if you don't want a full IDE environment and are more inclined to do stuff by hand :).
Aptana with the Rails plugin is pretty good.
+1 for Netbeans for Rails. Each release gets better and better and with 6.7 beta it's better yet. Using it on Windows and Mac -- under Linux it's what I'd use as well.