Hi.
Mostly-lurker here, save for the occasional mildly pithy comment. I'm a DBA/sysadmin by day, studying towards an Econ + Maths degree in my spare time. LW has a lot of parallels with my fields of interest, elucidates on a lot of areas where I have half-formed ideas and provides exceedingly worthy arguments for things I don't agree with.
Some research says that lurkers make up over 90% of online groups. I suspect that Less Wrong has an even higher percentage of lurkers than other online communities.
Please post a comment in this thread saying "Hi." You can say more if you want, but just posting "Hi" is good for a guaranteed free point of karma.
Also see the introduction thread.