The Windows Vista Developer Story: Application Compatibility Cookbook
MSDN has a Vista developer story series on how to develop applications for Windows Vista.
http://msdn.microsoft.com/windowsvista/downloads/docs/developerstory/default.aspx
One of the particularly useful articles is on Application Compatibility
http://msdn.microsoft.com/windowsvista/downloads/docs/developerstory/default.aspx?pull=/library/en-us/dnlong/html/AppComp.asp
(also at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnlong/html/AppComp.asp)
It details many of the changes in Vista and how to change your application to comply with the Vista paradigm.
Definitely worth a read.
