Handy howto edit PDF metadata using pdftk. In summary: `pdftk file.pdf dump_data output file.txt`, `gedit file.txt`, `pdftk file.pdf update_info file.txt output newfile.pdf`
Detailed walk through with pictures on how to open and disassemble the Kindle 2. The battery is fairly easily replaceable.
I think this was the original "tether your kindle via usbnetworking" post. The same fella also hacked his Kindle to get Ubuntu running (more or less) on it.
Quick tip on how to eject an Amazon Kindle on Ubuntu. sudo eject Kindle (or appropriate device name if you changed it).