To make a long story short, I've been to the Apple store multiple times, on the phone with AppleCare multiple times, and am sitting in front of my second 24" LED Cinema Display. Neither mine nor my wife's MBA Rev B (both 1.8 SSD, 10.6.2, new CD firmware) could properly drive either monitor without the screen "glitching" (improper synchronization, resulting in horizontal shifts of chunks of pixels for a fraction of a second). I've read a bunch of posts, and it seems that a number of other users encounter this problem, maybe calling it "occasional flicker?" This flicker happens every few minutes at this point, making it more than "occasional," and, quite frankly, unacceptable. Additionally, the entire display with just go black for a fraction of a second, though this happens maybe once an hour or so. I've done all the usual things (reset the SMC, PRAM), and I've driven projectors (MiniDisplay -> VGA or MiniDisplay -> DVI) from this laptop without incident. The monitor is plugged into a SmartUPS 750, so the power is as clean as can be. It doesn't matter whether I run it in clamshell or open modes, with/without the bluetooth keyboard/mouse. It doesn't depend on the load - it will happen running heavy MATLAB computations, or just reading e-mail. Also, since resetting the SMC, when I run the MBA in clamshell mode, and I disconnect the MagSafe connector from the laptop, it immediately puts the computer to sleep; this is actually handy, as it saves me a step, but it didn't used to happen - what happens on your MBA/LED CD when you disconnect? Any suggestions/thoughts to continue to troubleshoot would be appreciated. Thanks!