I'm not trying to start a PC vs Mac war here, but I really dont see why people say that Macs are so much better than PC's. I've been using PC's for years and recently had to babysit my little cousin and his family has a Mac. I dinked around on it for a few hours and came to a conclusion that its nothing special at all.
The only times I've really truly had trouble with PC's is when there was a computer that my whole family shared. Ever since I built my own PC I hadn't had any major problems or annoyances.
On-topic: Like a few others said, Window Blinds and/or http://www.wincustomize.com