You could try either Videomaster Falcon (Hisoft) - Okay but not Great! Low quality moving image, reasonable stills.
Vidi 12 (Rombo) - Good Quality Still image grabbing!
Or Titan Design's Expose! which is probably the best for Still & Moving image!
I own the first two.
There is no specific Webcam I know of but Expose features a piece of software that allow's you to monitor a camcorder in a window on the desktop, there's a possibility! Still have to write a driver but only for your browser!