JetBrains has recently started the JetBrains Seeder Program, an attempt to build a volunteer evangelism network for their products. I'm not sure I'd make a great evangelist, since my use of IntelliJ IDEA has mostly been limited to my experimentation with Groovy. I might join the program anyway, since IntelliJ is a great IDE (especially for Groovy) and I'm curious to see how the seeder program works.
Update: I decided that I'd already signed up for enough programs like this without taking full advantage of them. As a side note, I've been trying out NetBeans 6.5 for my Groovy and Grails projects and have been pleasantly surprised. I'll have a dilemma on my hands when it comes time to either renew or drop my IntelliJ license in April.