Here are two excellent freebies for organizing your music.

The first is MediaMonkey, available here: »www.mediamonkey.com/
MediaMonkey is excellent for tagging and organization. You can manage a library as large as 50,000+ files. The program allows you to move and rename files and folders from the MM interface. You can organize, browse, or search music by Genre, Artist, Year, Rating, etc. or by location on your hard drive. It will synchronize with iPods, MP3 phones and other Portable Audio Devices and has a built-in ripper and player or you can configure it to use Winamp for listening. The tagging info comes from Amazon. It handles a variety of files such as OGG, MP3, FLAC and WMA files.

The second recommendation is The Godfather available here: »users.forthnet.gr/the/jtclipper/
It has many of the same capabilities as above but may be a bit more difficult to use. One of the highly usable features is the ability to rename several files at once with one click.