I'm new as well. I've been using bitminter after running into some connectivity issues to slush.
Slush's pool seemed like a better return than bitminter.
I just did the same thing. Gave bitminter a try for a day or two but the returns sucked. I started out with slush's pool and got familiar with the various tools (cgminer, rpcminer, etc). Now I'm back at slush's. I get about 1 stale every 2000 blocks which is way better than what I was getting at bitminter. Plus the rate im hashing at +100 Mhash/s at slushes than what I was at bitminter.