I am mining now at Deepbit for 2 days.
My shares are going up, as it should be.
But my balance hasn't changed in these 2 days.
Sounds like your using the proportional payout?
If that is so then you won't see a balance until a block is solved. Deepbit hasn't solved a block going on three weeks now.
Hopefully soon. I think it worked out at around 25 days for an average of 1200Ghs so may be 30 days is realistic but luck !