I've rig of 2.2 Mh/s and before few days on hashcows in 12h period I got around 0.005 BTC.. next day I tried with Middlecoin, much better...around 0.011 BTC / 10h
With 2.1Mh/s I was lucky to see .018 BTC / 24hours on Middlecoin....I decided to switch to hashcows and try it out for a bit to see if it can do better.