some gripes i have discovered:
1. no copy/cut and paste in finder. drag and drop works most of the time, but sometimes if you need to copy or move something from one folder to another, its easier to cut and paste vs navigating to source folder, open new finder window, navigating to destination folder, arrange folders side by side, drag and drop.
2. no universal uninstaller. yes, apps are mostly self contained and you can just trash the .app folder, but many also create files in the system and library folders. AppCleaner does a good job, but we shouldnt have to rely on a third party app for something like this.
3. no easy way to specify regular Sleep vs Safe Sleep (ie Hibernate). i want to hibernate when i know it might be several hours before i need to use my MBP. i want to sleep when i will need it again soon (eg. going to my next class), or when its plugged in since battery isnt an issue. i have it set to hibernate when on battery and sleep when on AC, but its still not optimal.
4. plugging (more specifically unplugging) USB devices wake up the computer from sleep. i put the computer to sleep at night, but the next day i might need to take it with me. unplugging everything then wakes it up and i have to wait for it to sleep again.
5. switching GPU on unibody pros. hopefully this gets fixed in snow leopard, its pretty ridiculous. on top of on the fly switching without having to log out, it should switch automatically when on AC vs battery.
6. folders in finder. i was used to it in windows, but it definitely made a lot more sense IMO. folders always on top of the list is just easier. i think i saw a post on here before that said it best: you're either looking for a folder, or you're not. so mixing the folders in with everything else in alphabet view and even arranging by kind just makes it feel more cluttered.
thats all i can think of right now. overall, i'm more than happy with the switch from windows.