I have SL GM working quite stable using a V5250 (X1600), but no QE/CI yet.
On that note, if anyone has ATIinject working under SL, I'd be very interested. (So far I have only seen downloads for 32-bit ATIinject)
As others have pointed out, there will likely be very little OpenCL support for now on anything except the 48x0 cards - see http://netkas.org/?p=182