Yeah, I am in the same boat - I have boatloads of unutilized bandwidth and storage space that I would love to contribute to a worthy cause like archive.org.

Ideally, I would like to be able to point at some RSS feed of torrents of relevant archive.org collections (whatever the curators believe popular enough to benefit from peer-to-peer distribution). I could then set a torrent client to donwload and seed everything on this feed.