Since launching the unofficial BlogEngine.Net forums a few months ago its been pretty slow trying to get people involved, but its very slowly starting to move and people are posting.
One of the best things about the forums and the part I have been spending the most time trying to keep up to date is the themes - I can honestly say the forums now have the most up to date selection of BlogEngine.NET Themes anywhere on the net!
So if you are looking for Themes, Extensions or general help... Check out the BlogEngine.Net Forums