I currently use Cheese, but it isn't really compatible with Shotwell because it doesn't save the date in the meta data - only the file name.
I could run a command to get the file name and put it into the meta data, but I wonder if there is another webcam utility that will save the date in the meta data automatically, or if there is a way for cheese to do so.
UPDATE - newer photos taken with cheese seem to. Maybe a backup / resore issue. I'd still be interested in others that do save it.