http://www.middlecoin.com/

Middlecoin

This pool automatically mines the most profitable scrypt coin, automatically exchanges those coins for bitcoins, and pays out entirely in bitcoins.

There is no registration. Simply connect your scrypt miner to middlecoin.com:3333 with your bitcoin address as your username, and any password. Payouts are automatic, and occur once a day, if your balance is greater than 0.01 BTC or if you haven't been paid out in 7 days and your balance is greater than 0.001 BTC.

Fee

The fee is 3%. The exchanges' fees vary, but are generally around 0.4% including the withdraw fees. So the total fees are usually 3.388%

Seems like a pretty good idea to me :) What do you think?