Microsoft (and others) had announed that its Fall Professional Developer's Conference (PDC) would be October 2-5, in Los Angeles. Yesterday, they canceled the event and are in the process of rescheduling it.

From their site:

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 codenamed “Katmai,” Visual Studio codenamed “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.