Pablo Galiano blogs about Visual Studio 10 extensibility and provides samples
Pablo Galiano, from Clarius, has produced some nice content explaining the Visual Studio 10 extensibility, which is based on the notion of VSIX, and also uses a lot MEF.
He gives some links MEF, and presents the Microsoft.VisualStudio.ComponentModelHost
He explains why the F5 experience (Debug or Run without debugging) is much quicker than in VS2008, based on the notion of extensions, and details the Extensions folders, and registry hive
He explains how the VSIX manifest has counterparts in the new project dialog
He explains that the exact same mechanism is used both by the F5 experience and the deployment
Deploying a VSIX from a MSI (using Wix)
Many of you will be relieved to know that there is no longer any PLK
Pablo finally explains how MEF can be used to extend packages.
He also created a new site in the Code Gallery (http://code.msdn.microsoft.com/VS10XSamples) that he uses to centralize all the samples he has been creating.