It's right on the front page of http://distrowatch.org : Knoppix 3.7 is now *officially* out! Some mirrors have not been updated yet, but this one: ftp://ftp.uni-kl.de/pub/linux/knoppi...4-12-08-EN.iso is. Download via BitTorrent is also available: http://torrent.unix-ag.uni-kl.de/ .
Have fun!