Thanks Mike for creating some clarification on the topic.
(And btw. I processed whole 640x480 images on the arduino and some external flash memory)
List of available TTL-Level VGA Cameras with RAW output-format:
C328:
http://www.kosmodrom.com.ua/pdf/C328-7640.pdf
µCam-TTL:
http://www.4dsystems.com.au/prod.php?id=75
end of list in all of the internet... this consumer market is frustrating for an engineer.