I just got a 13" MacBook Air and I'm having an issue with it; googling around I've seen slightly similar problems, but nothing identical to what is going on with mine. I have the trackpad set to use the "tap to click" option in System Preferences and I've noticed that after I sleep the machine and wake it again, something gets bungled with it. The tap to click either stops responding entirely, requiring that I use the regular physical click instead, or it's highly, highly unresponsive. I've seen other reports of erratic clicking and the mouse moving on its own after sleeping the laptop, which thankfully mine isn't doing, but I haven't seen anybody reporting this slightly more demure issue. In any event, rebooting the machine fixes the problem completely until I sleep it next. I'm not 100% convinced that this is an Air issue, however, since I think it affected my 15" MacBook Pro to a lesser degree right after I upgraded that machine to 10.6.5, but I can't be entire certain of that since I no longer have that laptop and rarely used it without an external mouse in the first place. Anyone having a similar issue? It's not a dealbreaker, but it would be nice to clear up.