NBlogr - ASP.Net ATLAS blogging engine
Ivan - our local Atlas expert has been busy putting more effort into the Atlas based blogging engine that he started putting together a little while ago.
A couple of days ago, he put up the latest version on CodePlex. This version is not yet complete (or fully functional), but it should give you an idea of whats coming. The NBlogr site still has the old (broken) code on it, but He tells me it will be updated real soon (as soon as he implements his fix for URL rewriting). Ivan tells me he wants to have a "good working version" by October 20. If you want to see what stage it is up to now, check out the codeplex project page and download a copy.
If you want to get your hands dirty with some Atlas development, he's looking for some other contributors. I seem to remember someone on the dot net mailing list wanting an open source .Net project to contribute to...
Also - if you have been meaning to get into it and have found it a daunting task, read Ivans experience along with the links he found useful here.