In my limited experience creating Internet pseudonyms, I've been quite distracted by the continual need to avoid leaving pointers to my True Name lying around -- excess mail to/from my True Name, shared files, common peculiarities (eg misspellings in written text), traceable logins, etc.   The penet.fi site explicitly maintains a list of pointers to the original address.  All kinds of security controls -- crypto, access, information, inference -- have to be continually on my mind when using pseudonymous accounts.  The hazards are everywhere.  With our current tools it's practically impossible to maintain an active pseudonym for a long period of time against a sufficiently determined opponent, and quite a hassle to maintain even a modicum of decent security.  Pointers to info and/or tools to enable the establishment and maintenance of a net.nym, beyond the standard cypherpunks PGP/remailer fare with which I'm now familiar, greatly appreciated.  Especially nice would be a list of commercial net providers that allow pseudonymous accounts.

I've had several years to establish a net.reputation for "Nick Szabo", and it might take a long time for any of my pseudonyms to catch up.   Altruistic sponsorship requires trusted friends knowing the True Name, but that public sponsorship itself provides important clues pointing to that Name.