You could try the Series 60 emulator from Nokia. It does allow you to "emulate" the camera functionality in its own way. For the viewfinder you have a image (viewfinder.png) and for taking a snapshot you 3 different images( camera.png, camera.jpeg, camera.bmp) depending on the format you requested.
I have used the emulator when i want to play around with MIDlets that launch the camera. It WORKS for me
There is a emulator from Motorola for the V600 that could be useful too although i havent played around with it.
Everything that can go wrong will go wrong -Murphy