For those of you interested in developing with Ruby on Rails using RubyMine, you may want to surf on over to InfoQ where there is a good interview with the lead developer of RubyMine, Dmitry Jemerov from JetBrains.
Dmitry talks a bit about the features of RubyMine, enhancements in upcoming releases, and a bit how the product compares to other Rails IDE's and text editors.

Check out the interview here.
Ruby on Rails Development: