Best webcam to use with Skype and a Mac mini? My users are requesting that we set up a conference room Mac mini (2009) for videochats using Skype.  

Since iSights are no longer reliably available (and I'm not going to give up my personal one), has anyone tried any 3rd-party webcams to use under OS X, such as any of Logitech's?  Any other brands you'd recommend?
Most modern USB webcams support a generic interface called UVC (Universal Video Class). OSX supports most UVC drivers out-of-the-box (true for me in Snow Leopard) so sometimes there aren't even any third-party drivers to install. (In fact, most third-party webcam "drivers" only install useless add-ons that bloat your system.)

Logitech is very good at providing compliant UVC devices, so they're a good starting point.

I have a Logitech C525, and it works great at 720p with its built-in microphone, using both Skype and Facetime. No additional drivers required.. plug-and-play!

Older webcams that do not support UVC will require drivers of course. Furthermore, super-new UVC devices may require an extension that OSX doesn't yet handle, obviously drivers are inevitable.

If you want a list of UVC-supported devices, see the Linux UVC page. (Yes, I know Linux != OSX, but this list can be used as a starting point of other brands you can try.)