Hey,
In the AFOLs comic:
http://news.lugnet.com/events/brickfest/?n=2596
I'm like the guy on the left hand side of page 10.
I was a kid with Classic Space, so that's my first love.
Castle. Duh.
I got the Rapid River Village originally for the elements. I was planning on selling the figs and teepees etc as a lot on ebay, but the set was just too darn cool. Now I have almost all of the western sets.
Castle Ninja is just way too cool. I don't have the biggest sets, but I've got most of the smaller fortresses.
I was 7 or 8 when Star Wars came out (and when Classic Space came out), so my childhood was dominated by two thing--LEGO and Star Wars. So, of course, the SW line brings all this together. (Not to mention how useful the figs are for castle.)
I love the Harry Potter books (the movies to a lesser extent), and my SO and I have gotten a lot of the HP sets.
Random things here and there like a couple of Adventurers, Spider-Man, and Monsters sets.
Etc.
It's much easier to say what I haven't gotten into:
Non-minifig lines (Model Team, Technic, Mindstorms, Belville, sculptures, etc.)--I guess I just love the little guys too much.
Trains--these are very cool, it's just that I can't really commit to a whole new system of building.
Pirates--again, a whole different type of thing (though I did get a boat hull on Bricklink for my LotR project).
Mecha--I just don't know enough yet.
and - drumroll please -
in some ways - Castle - if by this we mean the official line. I've picked up a bunch of figs, accessories, and speciallized elements here and there, but aside from the MOC Blacksmith Shop, I've never actually bought any of the large (non-Ninja) Castle sets. I'm much happier with bulk bricks.
Bruce