I'm using this and it's going well so far. Thanks!
One thing I've noticed is that it flashes the screen to update the screensaver even if the image hasn't changed. I noticed the Kindle has md5sum so I wondered what you thought of using a md5 to compare the downloaded file with the one in linkss/screensavers each time, saving the screen from flashing if nothing's changed.
Thoughts?
If everything goes to plan I'm going to release some code / words around this. I'll be sure to link to it for you if I do