Im running  POCLBM in command line on my 6850's

poclbm -d1 --host=xxxxx --port=8332 --user=bmgjet_1 -v 2 -f 2 -w 128
poclbm -d1 --host=xxxxx --port=8332 --user=bmgjet_2 -v 2 -f 2 -w 128

This command gets me 278-283Mhash on each card overclocked to 1ghz core 900mhz memory.
Its using some hacked up kernel that was posted on here last year and modified for best speed on 68XX cards.

Getting 5 shares per min on average sometimes hitting 6 if I dont use the PC.