Kenzer & Co put out some good stuff, much of it useful for d20. I just bought one of their products for 3.5E because it has so much good fluff and useful ideas.
I didn't list a cut-off date in my original post, since I wanted to give everyone who was interested a chance to respond, but I can't leave it as an open call...
So, anyone else interested should email me no later than Wednesday (5/9) noon (CST).