Is there a good way to capture an image of the current state of the "disk" on a GuruPlug?

I want to customize and develop on a plug, and then clone it easily to a bunch of other plugs.

Is there any way to capture the state of flash from uBoot on a guruplug, either using jtag, network, or USB key?

As an alternative, does anyone have a run-from-USB-key or run-from-the-network image for the GuruPlug?

I need to clone a bunch of customized plugs, and I don't want to use dd from the live filesystem, that always worries me.

Thanks

Is there a nice cookbook recipe for cloning a GuruPlug Server (running from internal NAND)? 

I've got about a dozen that I need to custom configure, so I'd like to configure one, create an image of the disk on a USB key, reboot the others using the serial console and restore from that image.

Thanks.