I can verify that this particular camera works under Linux (got it about a week ago from Adafruit). It is supported and recognized by uvcvideo. I tested taking snaps with cheese; guvcvideo works as well.
From my Fedora 16 workstation:
lsusb: Bus 002 Device 008: ID 0ac8:3420 Z-Star Microelectronics Corp. Venus USB2.0 Camera
dmesg: [ 119.902075] uvcvideo: Found UVC 1.00 device Venus USB2.0 Camera (0ac8:3420)
[ 119.903944] input: Venus USB2.0 Camera as /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.3/2-1.3.1/2-184.108.40.206/2-220.127.116.11:1.0/input/input8
[ 119.904013] usbcore: registered new interface driver uvcvideo
[ 119.904014] USB Video Class driver (1.1.1)
I poked around a bit and it looks like uvcvideo reports back a maximum of 1600×1200 (both photos and videos).. I did a bit of capture at that resolution to test and it works well. Also, here is lsusb with the -v flag if you’re interested in seeing more: