;)
I just checked the song count, by the way, and it's actually 503305, contained in 441902 files (some files can hold multiple tracks).
You mention in your FAQ that preservation is a big goal of this for you, and this is a very impressive collection that I'd hate to see disappear like some of the original sites!
However I want to wait a bit before doing so, because some of the archive sources haven't responded to the permission request I sent. And I don't want people to download their collections in bulk if they wouldn't want to.