Why? I've come to appreciate having a single machine & not having to worry about syncing stuff between machines, maintaining multiple development environments, etc ... While I'm impressed by the sheer amount of hardware in his household, I know it'd be a nightmare for me.
Yea. I used to have a few machines and I spent more time fixing bugs due to the dev environments when switching machines, than writing code. One MacBook pro replaced the lot and I've never been happier.
Dropbox would be a viable solution for that though.
Based on the sheer amount of hardware in his house (and who James Gosling actually is), I don't see why he wouldn't be able to afford a premium account.
He uses Dropbox. I've seen the icon on his Macbook Pro :)