Here are some information concerning the Labtec Webcam Pro device. I can understand the frustration of people buying a non-working device whereas others have already made some tests. Nevertheless, I **think** the huge compatibility chart shown on the spca5xx website should be applicable to the Efika.
Bus 001 Device 002: ID 046d:08a2 Logitech, Inc. Labtec WebCam Pro
The device requires the spca5xx driver which compiles fine "right out the box" (however I can now provide a precompiled version for a 2.6.19 kernel). You will probably have to load it with the force_rgb=1 parameter to get correct colors.
insmod gspca.ko force_rgb=1
This JPEG camera supports VGA (640*480) and QVGA (320*240) as "native" resolutions.
With 'spcaview', the best picture quality can be obtained by using the "-f r24" command line switch. 'spcacat' is quite buggy when you take single pictures (I **thing** the bugs are not related to the webcam...).
Weak point: in QVGA, there are some blinking lines at the bottom of the video (this is a known problem with this webcam, it's not ppc specific).
I should try the Microsoft LifeCam VX-1000 to see which one is the best.