Today we officially announced that PDC is the first time Microsoft will be discussing Windows 7 in-depth.

The big announcements are that:

• Steve Sinofsky will keynote on Tuesday at PDC
• There are 21 sessions on Windows 7 at PDC on everything from kernel, audio, graphics, networking, and more.
• All PDC attendees get a pre-beta build of Windows 7 on a custom 160GB external USB drive

Nice!