I was messing around last night, and I threw together a BTC-E trading bot. It's really simple, and has worked pretty well for me.
I'm looking for a few people to test it and make sure everything works all right.
Currently, it buys equal amounts of every cryptocoin, and sells them when it can make a profit. No rebuying is implemented yet, but it will be soon!
You can grab the source on GitHub here:
https://github.com/Jaxkr/Tradexkr