In addition to SW, I collect:
Simpsons (but not so much anymore)
Buffy (if they ever get around to putting more out...)
NASA Space Shuttle toys/replicas
Any kind of spaceships. I LOVE spaceships.
And the odd piece here and there.
I'd love to collect Marvel Legends, but I just don't have the money or the space. I do have a little space for Beast, though.