A look at Linq to objects and the "let" keyword

http://www.jaylee.org/post/2008/04/26/A-look-a-Linq-to-objects-and-the-let-keyword.aspx

Using Multiple Where Clauses in a LINQ Query
http://www.jaylee.org/post/2008/12/06/Using-Multiple-Where-Clauses-in-a-LINQ-Query.aspx