The timing of PDC07 isn't quite right for why we usually have a PDC, so we're going to reschedule it when the next wave of platform technologies comes. Think of it like surfing and you missed getting up on your board in time to catch the wave, so you're going to sit on it and wait for the next juicy party wave.
We are currently in the process of rescheduling this fall’s Professional Developer Conference. As the PDC is the definitive developer event focused on the future of the Microsoft platform, we try to align it to be in front of major platform milestones. By this fall, however, upcoming platform technologies including Windows Server 2008, SQL Server code name “Katmai,” Visual Studio code name “Orcas” and Silverlight will already be in developers’ hands and approaching launch, which is where we’ll focus our developer engagement in the near term. We will update this site when we have a new date for the PDC that is better timed with the next wave of platform technologies.
Microsoft will have a presence at several developer events this fall to provide deep technical training on the latest wave of software technologies, including at:
Source: MSDN Events and Webcasts: PDC07