I'm sure the webcam manufacturers take Macs into consideration, and will have the appropriate drivers on the installation disk.
But if you browse for a webcam in any supplier's, (even Tesco!) I'd have thought you would see on the box if it's suitable.
I have tried a few already and that includes Logitech but still no joy. I do have third party software that will enable me to run a webcam but none found as yet!
No. The trouble is with logitech is they have a list of webcams that are supported with the use of Mac but only OSX Tiger. That ain't cheap to buy! I don't want an expensive one because it won't be used enough to warrant alot of expenditure. I will keep ploughing through the web to find one!