I keep hearing about AxCMS.net.  Based on .NET 2.0, it is a open source CMS and I've seen a few people say it's better than DNN.  That's a big statement!  I have not checked this out so I'd like to know if you know something about it.

They have an interesting list of big name installations.  If this list is for real, then the product must be real.  Watch out DNN!  Competition is a good thing.