Jason Scott (of Textfiles.com fame) is leading an effort to archive GeoCities before Yahoo takes it offline:
Already, little gems have shown up in the roughly 8000+ sites I’ve archived. Guitar tab archives. MP3s that surely took the owners hours to rip and generate. GIF files, untouched for 13 years. Fan fiction. Photographs and websites of people long dead. All stuff that, I think, down the line, will have meaning. It’s not for me to judge. It’s for me to collect.
I can’t do this alone. I’m going to be pulling data from these twitching, blood-in-mouth websites for weeks, in the background. I could use help, even if we end up being redundant. More is better. We’re in #archiveteam on EFnet. Stop by. Bring bandwidth and disks. Help me save Geocities. Not because we love it. We hate it. But if you only save the things you love, your archive is a very poor reflection indeed.
This is a truly awesome thing to do.