@NiLuJe, thanks! And my bad, I guess. I was pretty sure I had run 11N as the jailbreak, but go figure. I'll try again.
EDIT -- OK, up and running and seems to work well once you cycle through your books and create the cache (had one problem where two different covers actually overlapped on the screensaver -- but didn't repeat after I turned the K3 back on and off). Also sometimes the cover doesn't change, even after the cache has been created and I leave the book open for a bit. But those are quibbles, and I'm sure you'll keep improving it, as always. Thanks again!
Last edited by rogerinnyc; 11-14-2012 at 12:59 AM.