I joined my first otherkin-list (TirNanOc) spring or summer 1997. Back then I thought I might be an elf, because I really liked reading about them etc.
In summer 2000 I was on 9 lists, now (winter 2005) I think I'm on 14 or so lists (some examples: elven-realities, lostkinproject, Otherkin, OtherkinCafe, KinFrontiers), don't know a bit what I am (mostly because of agnosticism, I think) but have met many wise and wonderful people on them.
Some links: