I cast about for a while for a way to download more than one Scrapbook image at a time, and didn't manage to find anything.
So I threw together
a wee Greasemonkey script that alters gallery links so they point to the images rather than HTML pages. This allows me to use a real downloader like
DownThemAll to grab a gallery's worth of images at once.
Please bang on it and let me know if it has any problems I should know about.