The most interesting news that comes fro the PDC is certainlty the announce of the Windows Azure platform.
Azure will be the start of a new era for the Microsoft's applicatons world. It will be a complete "cloud computing" platform available directly from the Internet. It will permit you to have a distributed infrastructure where you can host applications and (really interesting...) it will be completely integrated with the Visual Studio tools (it will be available a specific SDK for building applications for Azure).
The Azure platform embraces different services and technologies:
and, directly over the operating system platform, it will be avaiable an application platform (called Azure Services Platform) where there are available all the base functionalities for building applications.
What is important to note is that all these "Services" are cloud-oriented and they extend the tipical services available at the moment.
You can have more informations about Azure here...
P.S. on the image above you can see also a set of services called "Microsoft Dynamics CRM Services". The Azure platform could be the key for the future "on premises" and online set of Dynamics applications.