Just noticed that back in March, some new stuff went up on //www.costik.com - PowerPoint presentations that are quite fascinating. More computer game (of various stripes) oriented, but "Game Design Theory" (especially) is pretty general.
There's also a refernce to MAHK's Game Design Rants (http://www.world.std.com/~mahk/gamedesign.html), which is (based on a quick overview) also interesting.
I probably won't get a chance to read and cogitate on these until after GenCon, but I thought I'd throw the links out there.
Gordon