Take two Moog Ethervox Theramin devices. Place them a foot or so apart.
Take their respective MIDI outputs and plug them into your PC's MIDI port (you need to buy this as well).
Write a mouse-driver which converts the MIDI signal into the suitable 2-d coordinates; probably possible by triangulating the two signals.
Voila ! A mouseless mouse, and great sound effects as you navigate through that boring spreadsheet and all for a mere $9,900. (maybe more, they're no longer manufactured apparently).
Oh - forgot about the mouse buttons - ok , some converted sustain pedals, and a Wa-Wa for the little wheel in the middle.
Seriously, I'm sure this would work with cheaper Theremins-type devices just as well.-- monojohnny, Jul 05 2006 Moog Theremin http://www.moogmusi...?main_product_id=11Ethervox [monojohnny, Jul 05 2006] was he on a stair?-- po, Jul 05 2006 I've seen theremins for considerably cheaper than that. If you didn't actually need to use it as an instrument, you could just have a theremin-like-device that went striaght to a PS2 port. [+]-- gisho, Aug 02 2006 Yay! A mouse organ-- Dub, Aug 02 2006 random, halfbakery