I have an obsession with horror, so I collect horror movies (and games) that I like to watch with my friends. I have a wide variety of books, both fiction and non-fiction, including some weird occult stuff that would probably make my religious family in the States nervous.
I'm an aspiring artist (ugh) so I'm starting to collect artbooks. They're a lot of fun to look through and marvel at, especially concept art for my favourite movies and video games. They don't motivate me so much as being examples of what I'd like to be able to do someday.
I... yeah, OK. Warhammer 40k. It's hard to motivate myself to paint them though, and my 2000 point Snakebites army is still unfinished and unplayable, even at lower points costs. I don't have any close friends that play and finding other players to trade bits with is hard to do. Plus Games Workshop hates players and is trying to claw them back by making bigger and bigger models and... I dunno if I want to keep going with this one. *sigh*
I'm an amateur ghost hunter, photographer and urban explorer. These hobbies tend to go together nicely. Sure it's not very scientific, but damn is it fun. Mostly it's just me testing doors in some abandoned building wearing basic protective gear with a camera around my neck. I want to visit Russia because of the vast amount of disused, gigantic facilities they have there.
I loved D+D when I played it. I really want to get into it again, particularly 3.5, but no dice. I still have my old character sheets and everything, including my miserably weak bard who was the sole survivor of my last campaign. Man... I wish I could still play. I wouldn't say no to a different tabletop RPG either, so long as nobody takes it too seriously.