Damnit, I just downloaded iTunes 5.0 because I decided I should after skipping 4.8 and 4.8, and I wish I hadn't :\
It mentions that it has a "streamlined interface" or something similar - what they really mean is that they removed any extra space that separated things! You now get a couple of pixes outside border, one pixel separating source list from track list, File, Edit menus etc all in a line with the program name (so no 'title bar') and the former LCD screen is now half white and half green :\
I'm going to have to see if I can get 4.7 or 4.8 installed back again.
[edit] OK, uninstalled iTunes (having exported my library to XML first) and reinstalled 4.7.1. Much better, now it looks like real iTunes instead of someone-removed-half-of-the-interface-in-cost-cutting-exercises-and-sod-the-final-look iTunes