I've been running on slush's pool for almost two days now with my 150Mh/s nvidia and my 45Mh/s nvidia laptop. I've managed to scrape together about 0.051 btc. Also if you try  BFG and slush's pool you want to use his proxie software (only for bfg and rpc) and connect to local host, you get a reward bonus because it's more efficient. You can also make namecoins at the same time, they aren't work as much as bitcoins but it adds to the grand total.

Slush Proxie:http://mining.bitcoin.cz/mining-proxy-howto