Talk about your .NET projects / Open Forum

Given that the "Software Development Community" meetup group is also covering MVC 3 this summer, I figure we'd take a little break from that topic. Rather than another presentation given by me, how about you bring in a cool project that you've worked on, or a problem that you've been stuck on, and we can discuss it as a group. Since our meetups usually run long, let's pitch in and order some food for this one. Any preferences?