Also on Code Gallery, in addition to the Vista Bridge, you can find an interesting bit of guidance for those developing Windows 7 applications. This is 43 pages of "what is special about Windows 7" written for developers. Curious about touch and multi touch? Ink? The new taskbar, ribbon, jump lists? Libraries? How to handle previews and thumbnails for your file type? Wondering what Windows Web Services are and how they differ from WCF? (quick answer - WCF is managed, Windows Web Services is native C++ - expect more on that from me when life calms down a little.) It's all in here, with plenty of screenshots. From here you will know where you want to drill more deeply, and you will know the names of features, which is usually key to figuring out how to use them.
http://code.msdn.microsoft.com/Win7DeveloperGuide is a good starting point, and you can join discussions and so on. The Downloads tab will get you the document in Word or XPS format.