I use a Stowaway Bluetooth MOUSE from ThinkOutside with my Thinkpad X40, which has Bluetooth built-in.

Anyone knows if there are any Bluetooth enabled NUMERIC KEYPADS on the market?

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.

Going for the DiNovo desktop is not at all bad idea. Thanks for the suggestion. Seems like there's no other Bluetooth enabled Numeric Keyboard on the market anyway. So until someone markets a travel-friendly version, the DiNovo could be an interim solution. Even if it is not travel-sized.

My desktop keyboard is getting old anyway, so one day I'll have to replace it. And when traveling, I could leave the DiNovo keyboard, mouse and Bluetooth hub in the office, and just take the numeric keypad along.

-I guess you can use the DiNovo NUMERIC KEYPAD indepently from the mouse & the keyboard?
-Does it have a an on/off switch (which stays off even when cramped inside a bag)?
-What is width & length of the DiNovo NUMERIC KEYPAD (couldn't find the sizes on the local Logitech site)?

1) You should be able to. Never tried it though. BT is supposed to be vendor-agnostic. Maybe I'll bring my laptop home tonight and see if it works.
2) No. I think it'll go to a sleep mode, but if keys get pressed, it'll wake up. Just pop out the batteries.
3) Not at the house at the moment, but I'd estimate it to be about 4x6.5" (+/- 0.5 inches each side). Thickness is around 3/8" along most of the body, around 3/4" at the top where the batteries (2x AA) are.