Unfortunately, you may be out of luck a bit with the Logitech camera if you want to use it other than your built-in iSight because there might not be drivers for it.
However in the interest of getting a non-iSight equipped Mac to work with a webcam, my research and experience has led me purchase, test, and get working a different camera, a RocketFish webcam which comes with drivers for Mac OS X. It's about $50, and while I haven't tested it on my Macbook, it works fine on a Mac Mini.
Worst case, you buy it and it doesn't work you can return it to say, Best Buy or some other place from which you got it.
You may also want to check out www.ecamm.com. They provide drivers that will let many Logitech web cams work with OS X.
Finally, if you are confining your video activities to Skype only, I would strongly recommend the Logitech Quickcam Pro for Notebooks. This is a 2 Mp camera with a real glass lens. It produces a vastly superior picture quality to any webcam I have seen before. While not advertized as being Mac compatible, it does work with Mac Skype, at least on Tiger.
I have an XBOX360 web cam and it works great, just plug and play. Bad thing is that there is not microphone on the camera so you will need and external mic to get sound. Also I have a Logitech webcam the STX model and I downloaded a driver from the macam website and it worked just fine.
Thanks for asking this question. I have an iMac24 and the webcam shoots over my kids' head or sometimes we want to position it without having to move the whole monitor...
Any other suggestions if I were to buy a new web cam?
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