How the technology works is currently unclear (expect to see a demo at CES 2010), but a logical solution would be that AirStash automatically syncs its contents with an off-site server -- similar to what Dropbox does today. If it truly is as portable as that, it will obviate Dropbox's (and MobileMe's) need to install any client software if you are, for instance, using a friend's computer. Personally, I'd like to see Apple purchase Dropbox and turn MobileMe's cloud storage into something usable; but in the interim, I'm excited by the prospect that AirStash provides.
[via Engadget]