It's only Thursday and I already have my weekend project laid out for me. I've been toying with Erlang for a while, dropping it for a month or so only to pick it up again. I haven't written anything of any size, but now that the wedding is over I'm going to dive back and and build a little test app, possibly deployed on EC2.
Here's an interesting post about Amazon's SimpleDB internals. Yep: it's Erlang.