I'm giving ZumoDrive a test drive right now....does similar stuff. ZumoDrive actually makes itself look like one of your drives (Z
. You get a gig for free. Also, it keeps the files you use often stored locally for those times you're not connected to the 'net. I like it so far. My wife uses it with her Netbook and really likes the functionality. I have the ZumoDrive app on my IPod Touch, and really like having access to things that way.