Of note the Mac friendly Genius WideCam 100F, as the model name implies, features a really wide-angle field of view ideal for group video conference rooms or wide area security monitoring. It supports 1080p HD webcam resolution and hast stereo built-in microphones.
H.264 video compression built-into the web camera's hardware is something we'll be seeing more of in future models of Mac compatible webcams.
Creative specs for the InPerson HD state Mac OSX Leopard 10.5+, Snow Leopard or OSX Lion. As with many cross-platform compatible webcams, the bundled software is Windows only, but base functionality is assured thanks to it's UVC - USB 2.0 Video Class compliance. Keep in mind - HD video resolutions require fast dual-core Intel CPUs and online HD chat - and also REQUIRES a high-bandwidth internet connection to deliver good frame-rates in 720p HD modes.