MSDN Article on Enumerable Class
I recently ran a two-part article on the Enumerable class in MSDN magazine. Unfortunately, there's a significant lead time on these articles, and I wrote it using VS 2008 RTM. VS 2008 SP1 introduced a breaking change in the Enumerable.Cast method, so the demo has a number of procedures that fail with exceptions. I'll post revised versions of those procedures as soon as I can, but for now, just know that I'm aware of the problem, and will need to fix the code.
The article starts here:
http://msdn.microsoft.com/en-us/magazine/cc700332.aspx