Darn it!
After reading several friends talking about it for a while, I had to go check out Bookcrossing. And now I'm a member. Once I get a few books ready to release, we'll see how it goes. RenRats are obsessive readers, by and large, so perhaps releasing at faire will let me net some results. :) It seemed like fun, and a reasonable way to thin out some of my paperbacks that I'm unlikely to read again, or have multiple copies of.