On my 24" iMac which I have a Magic Trackpad for, I can use the trackpad to wake up the computer (which is only sleeping the screen and not the HDD) just by touching it. Barely a swipe and the screen comes on. On my new 27" iMac which also has a trackpad, I have to press to click on the trackpad to wake it. Same settings as far as tap to click and display sleeps but drives do not. The 24" is still running 10.6 while the 27" came with Lion. Is Lion the reason I have to click the trackpad as opposed to just touching it to wake it. I couldn't find any settings in the OS for that.