Hey, i've been mining for a few weeks now (first couple of weeks was on an 8800GTS that only did about 30 mh/s) but only recently got a 5870 and started mining properly. Just recently decided to stop being a lurker even though I should really be writing my final year project proposal.
Shameless attempt to get un-noobed. Just found out my local supplier of 5870s has run out of the cheap Radeons, shame I only had chance to get one before they did