Some cool Rainbow blogs
Until recently, I didn't have much experience with either Rainbow or DotNetNuke. I've heard a lot of great stuff about both and am still stumbling around through them. Here are two pretty good resources though if you're interested in Rainbow...
Eric Ramseur
Rahul Singh
I feel like I'm a day late and a dollar short on both of these projects b/c they've been around forever and until recently, I was never acquainted with them. Better late than never I suppose ;-)