The ACM CCCS'98 conference (November 1998) has recently been announced on cryptography@c2.net. There will be a panel on "Anonymity on the Internet", moderated by Paul Syverson. There's also a paper discussing the attacks nym.alias.net has had to face: David Mazières and M. Frans Kaashoek. The design, implementation and operation of an email pseudonym server. In Proceedings of the 5th ACM Conference on Computer and Communications Security, 1998. ftp://cag.lcs.mit.edu/pub/dm/papers/mazieres:pnym.ps.gz