I've been having fun over the last few days with putting a Linux
installation onto the SD card in my phone, so that I can then boot my
computer up from it. Just plug the phone into any old PC, reboot, tell
it to boot off the USB device, and there you go... all my docs are now
stored encrypted on my phone, and I can even mount the encrypted
partition directly on the phone if I want so that I can get to the files
when I'm on the move. I've been carrying a live USB stick round with me
for years, but I might ditch it in favour of just booting straight off
the phone.
Full details if you want to try it out:
http://let-the-reader-understand.blogspot.com/2011/03/how-to-use-your-and...
James