Recently Eclipse has been giving me problems, closing suddenly, troubles to start, too slow to start and when I was updating some plugins it started to some weird things when I write, every letter appeared to the left of the previous one. So I decided that it was time to change IDE and I found that NetBeans has added support to Ruby/Rails in a plugin and the reate of updates and new features is fast, so decided to try it.
From the start it seems to use less resources than Eclipse, and better yet, if you only need an IDE to Ruby/Rails there is a reduced version of the IDE (just 22MB). But what is interesting is that they are constantly adding options and features without letting bug fixing on a side.