My fiance and I recently adopted a 4 year old Boston named Harmony (that's her in my icon) from http://www.midwestbtrescue.org/. It was a great experience and we love her to death. If you're in MI, OH, IL, or IN and want to adopt this is a great organization. They update their website pretty often with different dogs (and seem very honest with the descriptions), so it's worth checking once in a while. Also, they're looking for foster homes if you're not ready for a commitment.
I think this community will be fun to hear other people's stories and experiences with their Bostons. So far the only issues we're having with her is biting when she's excited. Not a mean bite, just a I want to play with you bite. Other than that she's as sweet as can be.