some kind of usb key perhaps... it's already used for signing or licencing... although it can be used so nobody else can access to you private data in case you lost the flash drive.
In any case, this can be a good thing. In case your pc die... you just go to another one, and voila! all your software and data redy to go again... meantime you can fix the other one.
A really movile profile, with all your goodies in there... The only problem i think it's the flash memory speed... it really suck
