mostly things that I find cool and can actually find in my local area. Most of my collecting has died down due to my increasing family.
Besides GiJoe, I collect: some Star War figs (less then 30). A fair amount of LotR, A small smattering of DC Superheros, a decent amount of Marvel Legends (Toy Biz) figs. Batman and Starwars Lego, Dragon Megabloks, and couple of odds and ends like Buffy & Angel, A few TMNT, Simpsons, Family Guy. Most of those lines I really don't have any intention of collecting I just happened to stumble across them and decided I want them. I have some old Warhammer Fantasy figs from years ago stored in the house.
As I said, most of my collecting has died down mostly dues to insuffiecient funds as a result of having kids, the 25th line is the last line I'll be collecting (no movie joes for me), once I can get most of that I'll probably stop collecting anything new and pick up only the occasional thing.