Have you looked at alt.anonymous? I haven't, but the description on one list says it's on encrypted messages to unknown recipients. Like the blind mailing list thing - everyone gets everything, and only what was intended for you will decrypt with your key.
I haven't either. :-) I don't like the idea of a blind mailing list as it is hard to filter it. I already have enough problems just with reading cypherpunks, and the way I've solved it is via two accounts. One for cypherpunks mail and the other for normal private email. Addinmg any sort of extra noise would make things much harder. It would be nice if I could use a new mailer that automated the filtering process and presented several folders (personal, cypherpunks, blind-mail) and knew how to filter blind mail to pick up only mail intended for me, and automatically be able to handle message signing, posting to the blind list, etc. Message signing/verifying isn't a simple issue when you're dialing up a unix box and using its mail program. Unfortunatly, SLIP access is not given so I can't use a mailer on my own end to help automate this a bit. Storing a private key in my unix account is a bad idea. There have been plenty of break ins to the machines I use, luckily I haven't had my accounts screwed with (or if they're compromised, nobody fucked with my mail...) :-) But actually having a news group and a few automated junk mailers post to that to foil traffic analysys is needed...