In addition to the other preference settings dropped in iTunes 8, the option for naming tracks on import without adding the track number to the front of the filename is missing; luckily, the preference is only hidden. If you find those track numbers annoying as I do, just quit iTunes, open Terminal, and enter this command:
defaults write com.apple.iTunes create-filenames-with-tracknumber -bool FALSE
On relaunching iTunes, you will find that track numbers are no longer added to filenames on import.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20080930161619878