One thing that our IT people complain a lot about is that some of the macbooks don't have enough power on their USB ports/port replicator, so you can't attach some USB devices when on battery. Even more infuriating, for some projectors don't work without the notebook (because the port-replicator does not have enough power).

I also find it very interesting that if there is a problem with a some website/file/software mac-users blame it on the software (and actually windows users agree even if it works fine for them), but if it's a Linux user that has problems, it's always "because he/she is using Linux"