The Professional Developers Conference (PDC) is an event that Microsoft organizes on regular basis focused on the technical strategy of the Microsoft developer platform. the event pushes latest updates of development platform from Microsoft and the Attendees from around the world learn about the Microsoft developer platform directly from the people who make it happen.
The PDC is for developers, architects and technology leaders who are involved in making strategic technology decisions for their company or organization.
Over the course of years.. from Windows 95 to Windows 7, these events can be glimpsed at MSDN blogs. 
Catch out more action and PDC keynotes and sessions from 2008 – 2010 now available on Channel 9 at http://channel9.msdn.com/Events/PDC?page=1 . For all those who are loving Windows 7, and interested to see Windows 8, stay connected to PDC updates as it is rumored Microsoft may reveal Windows 8 beta 1 at the PDC 2011 Event at Anaheim Convention Center in California during September 13-16.