Well I couldn't get cgminer to work for me. I opened it ok and it just stays at loading. no errors or anything. IDK. I think I'll just keep mining on pool.itzod.ru since there's no fees and when your software upgrades to support stratum, then I'll go to slush's pool.
I'm getting 1475 mhash on my two gigabyte 7870 GHz editions overclocked to 1225 MHz. Very nice rate IMO. with 4 difficulty I get about 0.25% stale
Switch to p2pool. No fees, and it moots the issue of stratum (p2pool supports it, but all traffic is local anyways).