One of the things I hate about iTunes is that if I want to edit the name of a song, I have to either click on the name and wait for it to figure out that I'm trying to edit the name, or open the Song Info window, which is slow and cumbersome if I'm just editing the name.
I just accidentally discovered that if you hit the Enter key (not the Return key) while a song is highlighted, it immediately changes the name field to edit mode. Yay!
Mac OS X Hints
http://hints.macworld.com/article.php?story=2005051118320432