I’ve been spending much of my cycles in the RadRails IDE and its a pleasure to use. It’s missing the refactorings and extensibility of full-blown Eclipse but I like the fact that its lightweight. I’ve used Eclipse and it just feels rather sluggish, RadRails is a snappier experience. As with the best things in life, RadRails is of course entirely free.
So too have I been using Ubuntu 7.04 or Feisty as its also known and i’m impressed with the environment, especially when compared to my usual development environment which would usually consist of a VM’d Windows 2003 server and VS.NET in one of its several incarnations.