Horse figurines (Breyer, Hagen-Renaker, whatever, but the more realistic, the better)--I used to be really rabid but I've slowed down some. If anyone needs a fully-functional Western saddle in 1/32 scale, though, I can tell you where to find it. I've got a few cow, dog, and cat figurines to go with them.
Trivia--oh, my God, the useless facts I have filed away in my head!
And, of course, music (is there anyone in here who DOESN'T collect music?); mostly old American music, in any form (field and commercial recordings, written, in my head, whatever).
Designs and patterns--anything I can use as a basis for painting later on.