iSight, the only one web camera I can think of. But if you like to try others, most camera maker does offer the camera drivers for Mac OS X whatever 10.1/10.2/10.3. But you can buy a webcamera from IOXperts, it will cost you US$19.95. Here is a list of which web camare can this driver supports:
IOXperts OS X Driver for USB WebCams Works with These Devices
* AME
o CU-001
o CU-98
o CU-98A
o CU-99A
o CU-320
* Ariston iSee-Pro
* Boeder PC ChatCam
* Creative Video Blaster Webcam 5 (some)
* D-Link DRU-350C
* Ezonics EZ Cam Pro
* iRez KritterUSB 1.0 (but not 1.1)
* Logitech
o QuickCam for Notebooks Pro (not QuickCam for Notebooks)
o QuickCam Pro (dark focus ring)
o QuickCam Pro 3000
o QuickCam Pro 4000
o QuickCam Zoom
* Mustek WCam 300
* O'Rite i-Cam USB Camera
* Panasonic GP-KR651US
* Philips
o ToUcam Fun (PCVC730K)
o ToUcam Pro (PCVC740K)
o ToUcam Pro Scan (PCVC750K)
o ToUcam XS (PCVC720K/40 only)
o Vesta (PCVC675K)
o Vesta Pro (PCVC680K)
o Vesta Scan (PCVC690K)
* PINE Technology PineCam Z100
* Plustek OptiCam 500U
* Samsung
o AnyCam MPC-C10
o AnyCam MPC-C30
* Scalar
o USB Microscope M1
o USB Microscope M2
* Sceptre
o SVC300/KVC300 (black & silver)
o SVC300/KVC300 (green translucent)
* Sotec Afina Eye
* VideoLogic HomeC@m
Good luck~~