Funky, dumb, cool(?) gadget by Sony in cooperation with Skype: a mouse-phone, eh phone-mouse, hm.
The Sony VAIO VN-CX1 functions just like any optical mouse, but when you press a small button on the side it transforms into a VoIP phone. Unfortunately not wireless, not that cheap (83$) but maybe still handy.
Why have 2 devices when you can have 1?
Because I don’t want to be tied to my PC? :-)