Hi Guys -
Love the new calendar features. New forum... not so much. The simplest forum in the world is just a vBulletin or something similar. This is what people want from you for a forum. What you delivered seems like a slightly nicer layout to the genius thing you had before. I honestly don't see people really using this a lot. I could be (and hope) that I'm wrong. To see what the forums SHOULD look like, go here:
It should only take about 10 minutes to install and completely configure. If you have to install a few mysql (or similar) backend, maybe 30mintues to an hour. This is the way to go.
Just my opinion.