I found a great site last night called OldApps.com.
It keeps old versions of applications available for download.
I was having trouble with the new version of iTunes (10.2.2), it seems to have broken the ‘organize media’ function. I was able to download 10.2.1 from this site.
I uninstalled 10.2.2, installed 10.2.1 and the organize media function now works.