Comment Device encryption on Honeycomb (Score 1) 238
Honeycomb 3.1 has the option to encrypt the whole filesystem. It failed initially on my Transformer, but I read somewhere that they fixed it.
I don't know what that means for access via USB to the SD card, but if you device has been turned off, the filesystem can't be accessed until you type the encryption password.
It's not the magic bullet, but it's an extra step