since I'm a contributing member of the Visug site, a Belgian user group, I was asked to create a custom module for DNN. Since I never before played around with DNN I found this site to quite interesting for beginners: DNNWiki.NET. Especially the video tutorials were very interesting to get started with building your own custom modules for the platform.
Update: I just noticed my buddy Gill Cleeren wrote an article about How-to: DotNetNuke: Installation. Check it out if you're interested on setting it up on Vista with IIS7.