Mac only: Unhappy with the way iTunes 10 moved your window controls around? Make iTunes look like your other windows again with a one-shot Terminal command.
CNET's MacFixIt details all the tiny visual changes that took place between iTunes 9 and 10 — far more than most initially noticed. But they also provide this Terminal command to type in if you'd like to move the Close/Minimise/Zoom button set back to horizontal layout in the upper-left corner:
defaults write com.apple.iTunes full-window -boolean YES
If you decide to give Apple's redesign another try later, type in the same command, but trade YES for NO.