I tried programming Scala in Netbeans and Eclipse, but it is not what I'm looking for. In Netbeans suggestions for method names etc. are not working. In Eclipse I can't go to some classes sources by pressing F3. (e.g. scala List).
Is support in IntelliJ IDEA any better? Are there other IDE's supporting Scala?
There's an official plugin for eclipse now.
I've tried it myself and it works perfect. Nevertheless all the IDEs here are great. They will probably all do what you want. You should go with the one you feel most comfortable with.