Hi Jeff,
yesterday I've successfully flashed a SeevaPlug with your bootloader. That worked fine and the system starts from a usb-stick out of the box, amazing. But there are some things to alter if you don't want to castrate the SheevaPlug.
I don't want to go to details now: Simple question: Are you interested in making the "Jeff's Way" usable for Sheeva? I think this would be a great improvement for Sheeva.
Greetings
Thomas