Canonical working on a Mac version of Ubuntu One app
Canonical has a job opening for a Mac developer. This position seems to be related to development of a desktop app for their Ubuntu One service.
Ubuntu One already has native apps for Linux and Windows operating systems. It also has mobile apps for Google Android and Apple iOS.
Mac OS X is the only major platform not supported natively. Users on Mac OS X can however access their content on Ubuntu One through a web browser.