fwiw, with flash files, sito will grab the first frame of the flash animation to make the little thumbnail. this is often blank or otherwise non-representational or boring. you can, under "edit image info", however, send a new image (such as a screen capture) for the thumbnail. (i did this for your latest flash-card.)
i mention this for the edification of all sitoids, and also cuz you have put up a few cool/cute/crazy flash files, and thumbnails are more fun when they arent white chunks.