Just non-d20, huh? In the last week:
7th Sea
Stormbringer 5th Edition
Mongoose's Rune Quest
Exalted 2nd Edition
And I didn't even go to GenCon
Over the last year, no way I'll get them all, but here goes:
Shadowrun 4E
Burning Wheel
Legend of the Five Rings 3E
GURPS 4E
Fireborn
Rifts Ultimate Edition
Ars MAgica 4E
Without having access to my library at the moment (I'm at work), I think that's about the gist of it. Add d20 based systems and you could probably double that list. That's just core books. Add all systems that I bought suplements for, and you could probably triple it.
I'm a sucker for interesting rules.
Just to give d20 a shot:
Arcana Evolved
Iron Heroes
True 20 (This Week)
Thieves' World (This Week)
A Game of Thrones
Spycraft 2.0
Mutants and Masterminds
Black Company
Lone Wolf
Grim Tales
Midnight
Man, this is hard without looking at my bookshelves. Anywho, I'd guess that's most of them. I do tend to buy a lot, and the last week or two have been very good to me. This list doesn't even scratch the surface of the various DnD and d20 Modern books that I've bought in an attempt to fill out my collection, and the suplements for many of those systems, and a great many more I've been collecting for years.
The funny thing is, I don't have time to read many of these. With the exception of Shadowrun, Fireborn, and Spycraft 2.0, I don't think I've actually read any of the stuff on this list, and I've probably not even opened half of it longer than to write my name in the cover.
Man, that's depressing. I actually brought a couple with me to work tonight, so hopefully I'll get offline and actually read something.
Edit: Got home and realized I forgot a couple.