Ubuntu One cannot be compared to Dropbox, at least not yet: It does not support OSX and it does not support other Linux operating systems either, not even its daddy Debian.

I run Windows and Debian on my desktops and laptop and I recently decided to try Ubuntu One. I could find no mention of other Linux OSes on the Ubuntu One page, and a quick web search returned nothing encouraging.

I was surprised by this. The impression I got is that Ubuntu One is just for people whose main OS is Ubuntu and who may have to also use Windows from time to time.