I also think freeride is neat, however, if you want a full ide, and are 
willing to drop a little coin, Ativestates Komodo is supposed to be 
pretty good, and there is another ide called arachnoruby which is also 
supposed to be pretty good.  I pretty much use vim for all of my ruby 
editing, so unfortunately I can't give you any details on how good 
either of these products are.  I know they both feature debugging 
capabilities which would be the biggest selling point for me personally. 
Freeride also has debuggin support.

Hope this helps
   Gary Watson

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