I'd say I collect DVD's, buying movies I haven't seen based on word of mouth alone.
I buy pretty much every gaming system that comes out
I've just recently started collecting Samurai Swords, I love the way they look and love the old Akira Kurosawa Samurai films, and just in general enjoy Japanese Culture.
The Swords i'm into buying are 100% functional swords meaning if you're not careful you can lop an arm off. But I respect it for what it is and have been tought to respect all kinds of weapons growing up.
It's a thing of beauty.