Slush is down to 5%. No PPS is hurting it in my opinion. I tried both on BTC Guild and PPS is much more lucrative than PPLNS (I know Slush is different with SCORE). No wonder BTC Guild has started defaulting new workers to PPLNS.
I will be back to Slush when it stabilizes.
The more miners that stay with Slush, the more likely our luck will change for the better (more miners = more chance to find a block).
K.