During the joint Gates/Ballmer opening interview at the D6 conference on Tuesday (all stories), the audience was treated to an early look at Windows 7, which, according to Ballmer, will ship to customers in late 2009. The demo showed a full-screen multitouch interface embedded in the operating system. We saw a demo of a Surface-like app for organizing photos, and what appeared to be the Windows 1.0 Paint app, except that you can now draw with all your fingers at once. Also, a digital globe app, where the two-handed interface makes good sense. And a piano app, on which, thanks to multitouch, you can now play chords.