You would have probably been better off purchasing an SD card based camera and hack the device to separate the camera and the SD interface with a cable in between.
I know that is not what you want to hear but the cameras you have only come with WinXP drivers (typically) and would be exceeding difficult to interface to a PDA.
Now, with that said, you could get one of these: Asus WL-HDD and flash it with third party Linux OS so that you can use the camera with that and send the video wirelessly to other devices. Of course, the camera would have to be on the list of one that function with Linux.
Pretec SDIO Smartcam 1.3MP SD Card, #OS-CAS - eXpansys Inc