I have been reading MSDN Magazine (and it’s predecessors MSJ and Visual Developer) for a number of years now.
Until recently there has been upto a 5 year lag between an article being written and being able to use it in anger.
Today I finally found a use for an article written in June last year (only 8 months behind)!
A really useful feature especially when combined with Code Generation:
(I have given up on adding tags around XML)
ItemGroup
Compile Include="*.cs"
/ItemGroup
This allows code to be added to the project without having to explicitly edit the project file.
Developer Rants 