Hi everyone!
On the basis of your amazing work, I wrote a little user interface that helps non-experts install the jailbreak and the screensaver hack more easily. You can find it here:
http://www.kubizo.com/changing-kindle-screensaver.php
Any feedback about it would be most welcome. I used Yifan Lu's jailbreak.
On that page I put a link to this website to give credit to the authors of the hacks. If you have personal websites you prefer me to link to, just let me know!
Kubizo