I'm on the internet in a few other places...
• If you're running Firefox, I'm in about:credits in your browser. I helped out with the Mozilla project for a few years in the early days.
• On OKCupid, I am dachte. Yay.
• Livejournal mirrors my BLOG ever since I glued LJ::Simple into POUND. I check both places for comments.
• I help maintain the Neuros Wiki

Games
• In Kingdom of Loathing, I am pgunn (and pgunn01, a largely retired alt)
• In DOFUS, I have a few characters, grep (Enutrof) and strace (Cra) being the most played.
• In Second Life (a game), I was LevDavidovich Brodsky, although I almost never log in anymore.

Also..
• In UrbanDead, I was pgunn (and pgunn01, an alt)
• I once played Shartak, as pgunn
• On PerlMonks, I am Improv. I don't login there very often anymore.
• On Wikipedia, I was Improv (from 2002-2004, I was Pgunn). I retired from Wikipedia because they're starting to move towards a less principled, less noncommercial position
• I was once lightly involved with the XFree86 group
• I used to be active on Usenet. I still moderate a few groups, but don't actively post anymore.
• I once was a groupie for Loki Games (a Linux gaming company, now defunct), doing beta testing and hanging out with their devs on IRC.
• I once was heavily involved with NoWonder, a project to provide free tech support on everything to everyone, before the effort became commercialised and then died.
• On NPTN, I was lb012
• I was once on Delphi, but I don't remember my (numeric) account name
• On Prodigy (a long, long time ago), I was txjc28b
• I ran a bulletin board called the QCBBS in the Cleveland area in the early-mid 1990s.