Two of my friends Chris Wilson and Charlotte Lowrie) have picked up the Lensbaby, and I have to admit, I'm really tempted. The Lensbaby is this funny lens with a plastic accordian-like body. You push, pull, and skew the body to focus the lens, but because the lens can move out parallel to the film/sensor plane, you can selectively focus on parts of the image, throwing the rest into a beautifully artistic blur.
It's a super fun way to shoot and forces you to really think about the composition. What's more, it's pretty cheap ($150). You can add macro lenses for another $30 or so.
It's on my Christmas list; who knows, I might even get one. If not, I'll probably pick one up for myself.