Well, there's the Logitech DiNovo media desktop, which has a BT keyboard, numeric keypad, and mouse all in one bundle. Might be overkill though for what you need. I've got one on my desktop at home, and although the keypad is certainly slim (Except for the battery bulge, it's less than 0.5" thick), it's not travel-sized.

A quick Froogle search didn't reveal much else. An alternate mini-keyboard called the "FrogPad", but that doesn't seem quite what you're looking for.