I didn't realize I hadn't responded to this yet! Love reading through what people collect-
I guess I collect when it strikes my fancy- custom ponies, G4s and MH, cute dolls.
I like BJDs- including Pullips and Dals, but I'm cheap so I mostly only collect close-outs, and even then, only once in a while. I have a couple Wilde dolls too.
I guess I actively collect So/Central American Strawberry Shortcake dolls- because they are so different and hard to find (specially from Peru).
I like some 80s toys but am not actively collecting unless I run into an unreleased prototype or something. My most special collection is Rainbow Brite (I was lucky enough to strike the prototype jackpot once)
http://galacticatt.wix.com/rainbow -
I also have a collection of Shimmers, Moondreamers, Lady Lovelylocks, and the Star Fairies. (although these are all packed away). I've tried to take pics of things (for insurance reasons) so most are up on Flickr as I get time.
http://www.flickr.com/photos/51192881@N00/