Personally I'm using burnside's litecoin mining pool

http://ltc.kattare.com/

Pretty good instructions on how to set it up and everything, and with my GPU's hashrate I'm making more bitcoins... by mining litecoins. Counter-intuitive but the exchange rate is pretty good right now. Of course you're taking a gamble, you never know if litecoins will crash or dramatically decrease in value, but you take the same risk with BTC.