I've not been that impressed by the choice of webcams currently available, as they're either mightily expensive, or mightily crap quality.
Anyway, someone rather special suggested using a PS2 EyeToy... something I'd already considered, but had been told that they're not compatible with PCs.
It turns out that someone with lots of time on their hands has tweaked a set of drivers for the EyeToy, and it does work on PCs with no trouble.
So, we ordered a couple... one arrived yesterday, the other arrives next week.
I installed the first one last night. Impressed? You bet! The image quality is fantastic!!! It's just a shame that the red and blue LEDs are so bright!
I'll post some images this evening.
So, the moral is: If you want a very good quality webcam, don't want to pay too much (it's only £29.99 on Amazon) and you're prepared to tweak driver settings if necessary, then the PS2 EyeToy is definitely recommended.