I was using deepbit's pool for a little while while yours was down slush, and I was wondering if you are planning to implement a pay per share model?
PPS is vulnerable to some kind of attacks (similar to classic sabotage), it was already discussed here. I know people like PPS (mostly beginners, before they realize that everything *really* converge to expected values and they are ripped of by 7%), but I don't want to open yet another doors to hurt the pool. I believe that proportional & score system is best option for serious miners, which is what I offer.