I didn't really see any compact boards that caught my eye. I think logitech, or one of those guys, had some media boards that had speakers, and a gaming board that had a small monitor on it that displays your stats while you play. I don't know about those though, cause I'm not even looking at my board when I play.
Most of the booths at Macworld were selling cases though, or some kind of new Mac software. I don't know if you went or not, but if you got to try out the keyboards at the DSI booth, it felt exactly like those old IBM boards. The contact and feedback felt solid, I didn't think I would be able to find anyone selling those kind of boards anymore.
I was looking through notestation.com though, and I saw this Ergonomic Wireless Keyboard that looks sweet. If you take a look at the picture, its looks really thin, I bet you could use it as a frisbee. Its compact, but it has a touchpad on it. I don't think its Mechanical though, cause it looks really thin. Here's the link:
http://www.notestation.com/wireless-mac-keyboard-W1000M.htm