What are the good Scala IDEs at the start of 2010?

Question

I know this is an exact duplicate, but a year has gone by and Scala seems to be a fast moving thing, so I figure it might be acceptable to ask again:

What is the bes

Answer 1

I know the Eclipse plugin is a work in progress and undergoing a complete re-write for Scala 2.8 but I saw a colleague use a nightly-build recently and it was extremely poor.

I use IntelliJ IDEA (the Community Edition 9 is free) and the scala plugin for it is really good. Excellent syntax highlighting, code navigation etc. It's not as good as the Java support but then I wouldn't necessarily expect that. It's good enough that I feel I'm more productive than I would have been in Java!

It has Specs integration and console integration as well.