Zenit Foto Sniper Camera:

It's an interesting idea - the rifle style camera mount should allow you to brace the camera more firmly against your body - and I'm assuming that you can 'shoot' with the trigger mechanism.

"Its basic principles are similar to a real sniper rifle, except that it shoots brilliant, contrasty pictures rather than bullets. The rifle mount and secure shoulder stock allow you to brace the camera against your body to stabilize it and minimize shaking. Leave the tripod at home - this is all you need for crystal clear shots at 1/60 or even 1/30 of a second. The camera and lens are more than capable for any task that you put them up to."

Personally, I think I'd feel a bit like a freak trying to use it, but I can image getting over that pretty quickly if the results proved it worthwhile...