A couple of smart kids from the Librie Yahoo Group have been trying to collect information on how to hack Sony's restrictive DRM.

They are looking for ways how you can "talk" to the embedded Linux in the hardware. This could for instance work through the USB port. Sony's website has a USB testdriver (for linux) to transfer files between the eBook reader and the host computer.

Another more crude way of hacking the Librie is to disassemble the Librie display (which is basically the only reason why we would want to get the damn thing) and connect it to a ARM computer board running Linux. The hardware interface should be similar as described in this datasheet.

I hope Sony reads this. They should open their eyes and finally acknowledge that they have been wrong all the time with forcing upon us their proprietary formats and DRM restrictions.
I hope that some other companies see this and realize that people want this technology. But with the Librie as an harbinger, no one will buy it and this whole line of product may stagnate...
Alexei Karpenko has some more interesting information how the Librie display is controlled: http://www.karpenko.de/librie/