After reading this from Ma.tt, I've downloaded dropbox, I've had it installed for less than an hour, but I figure they're worth a post purely for the kudos of releasing a true multi-platform application.
Finding something that can sync between my home linux box and work windohs machine is a real pain so I'm really hoping this will be the answer I've been looking for; it's not that win-linux sync'ing is impossible, it's just that it's usually restrictive or so complicated/ un-user-friendly that I never bother.
The only thing the service needs is some WordPress to "public box" integration and the solution is dam'ed near perfect ;)
While I to keep my fingers crossed that dropbox is everything I want it to be, why don't you try it out?