I was reading something about 50BTC having close to 50% or more of mining power? I'm going to make a special note NOT to choose them.
BTCGuild is much closer, check out
http://blockchain.info/poolsAhh there you go. I had the name wrong. Correct me if i'm wrong but we wouldn't want to join a mining pool with too low a hash-rate correct? Then coin discovery becomes less likely? Or more of mere luck over time?
Over a long enough period of time it doesn't matter, but it's nice to be part of a decent sized pool so you get consistent payouts.
Is it something like this:
Big pool[BTC Guild] - steady but low payout
smaller pool[Slush] - less steady but higher payout [more relative shares]