Lot's of riding going on, so not much time for writing. Sorry about that.
If you've ever wanted to learn the details of proper trail building (and there's a lot more than you think), IMBA's Trail Care Crew will be in the DC area. I've been to this class and it's definitely worthwhile. Details here.
The Pedal Shop in Ashburn, VA is having a bike swap, so if you've got a pile of stuff you need to get rid of or you are looking for deals, check this info for dates and how it's going to work. It's a bit different than your usualy swap.