So i don't really know when this happened, but my iTunes window has become too big for my screen, essentially the bottom is off the screen, and there's no way of getting it back because i can't reach the little size adjuster thing.
You could try editing the iTunes plist file (in home/Library/Preferences), the window sizes are stored there. I've never done it but it seems like it should work. Just be careful not to mess up anything else.