Thanks for all of the good leads.
I'll definitely add:
Bluffside -- Thunderhead Games
Green Races -- Fast Forward Entertainment
Dungeon World is no longer available, so I think I'll skip it.
It's true that the Iron Kingdoms setting still isn't out.

However, I'm going to leave it because, like Freeport, the adventures and other stuff that's out seems to more-or-less constitute a campaign setting, even if the details aren't too fleshed out.
Because there's so little available on Ptolus, I suspect it's best to pass on it for now. I'll certainly update the poll again after GenCon when some more of this stuff is released (Midnight's not quite out yet either, is it?).
Is there a 3e Dark Sun product or is it web-only? Where can I find it?
It seems like Diomin is safe to skip due to its apparent unpopularity.
I'll admit that I'm torn on unpublished (physically) settings, as I already have 26 and the results page is getting to be huge. However, there may be more people playing, say, Dusk than something like Green Races, so maybe I should add them. Other folks thoughts?
See
this thread for the questions I plan on asking as of now, and please feel free to add any!