If you look into the LINQ extension methods, you will run across Func quite a bit. If you see Func in a method definition, you can treat it like a big sign that says "Put your lambda expression here." This quick demo will show that Func is simply a shorthand for creating a delegate and that Func and lambdas go together hand-in-hand.
Get It Here
You can get the walkthrough (just 5 pages) and the code sample here: http://www.jeremybytes.com/demos.aspx#QBGF.