I've been reading Go books for over ten years now, but have only decided to join some online servers in the past month. At the moment (April 2005), I'm 20k on IGS ("gotirian") and 21k on KGS ("tirian"). I try to spend a portion of my day playing free no-handicap games against 25k+ folks in the "KGS Teaching Ladder" Room -- I'm hardly good enough to justify the use of the word "teaching game", but I'm happy to review the game afterward.
Outside of the goban, I am a computer programmer and a recreational mathematician. I am particularly interested in Combinatorial Game Theory these days, although I don't think that study of that field has immediate relevance to Go. I am also interested in abstract logic and language-neutral logic puzzles.