I would say that it's predominantly shops and new equipment vendors, but there are a few people that sell some vintage stuff. You can get some good scores sometimes, but if you're looking for a mainly C&V oriented bike swap, you'll probably be disappointed.

I'll have a gray Velo Cult t-shirt on tomorrow, if you see me, feel free to say hi. If anybody wants to meet up for a ride or a beer or two after the swap, you can also pm me to swap text/cell numbers.