I have two monitors set up at my desk... a 17" and a 15", which both run at 1024x768, the 17" is at 85 Hz and I have no idea what the 15" runs at.
The problem is that on the 17" I get this "filckering" going on on the right hand side (the side my 15" is on). It flickers on about 1/3 of the screen. It's still workable but it does become quite annoying. No real picture distortion, just darker waveyness.
Of course turning the other monitor off fixes the problem, but it doesn't help all that much...

