RubyMine by IntellIJ. RubyMine bills itself as “the most intelligent Ruby and Rails IDE”. IntellIJ by JetBrains is also a heavy hitter, consistently being in the conversation for best IDE for multiple languages. With that said, RubyMine is a very natural first option to explore.
Update: Netbeans has dropped support for ruby, unfortunately.
RubyMine from JetBrains. (Also available as a plugin to IntelliJ IDEA)
Have you tried Aptana? It's based on Eclipse and they have a sweet Rails plugin.
Redcar has been getting some attention lately, as well. Still early in its life, but it shows promise.
On Mac OS X, TextMate is a godsend.
The latest Netbeans IDE (6.1) has a pretty solid Ruby support.
You can check it out here.
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