http://www.alloscomp.com/bitcoin/calculator.php

With the current difficulty, at 2GHash/sec, your average generation time is 2 days, 7 hours, 5 minutes.

So, mining solo, every ~2.3 days, you would generate 50BTC. That's ~21.74BTC per day.

Now take out the fees for each pool:

Slush (2%) = ~21.30BTC per day
Deepbit (3%) = ~21.09BTC per day

This does not take in to account differences in stale rates.