I read this & thought it was interesting - http://www.theregister.co.uk/content/54/34656.html - basically saying how we are at the start of the USB dongles development curve - what it can be used for etc etc - such as having programs on there for mail and so on; idea being that you use the 'main box' for 'crunching' and the dongle for what you specifically want, as opposed to the next guy.
So; Questions -
Do you have one and is it used for anything more than file transfer?
If so, how, using what :?:
What type is it :?:
Value for money :?: