Here is a USB multitouch smartpad that serves as a touchpad and a numeric pad. The device allows two or three finger operation and you can switch between touchpad and numberpad modes.
The slim multitouch smartpad works with Windows XP and Vista. It measures 80 x 104 x 15mm and weighs 103g. The price is $40.
Asus VivoMouse Wireless Mouse with Multitouch Touchpad
Tue. Jun 4th, 2013
SMK-Link iCalc Bluetooth Calculator Keypad adds a Numpad/Calculator to Apple Wireless Keyboard
Thu. Jan 31st, 2013
HP TouchPad webOS Tablet Announced
Thu. Feb 10th, 2011