See http://msdn.microsoft.com/netframework/future/linq/default.aspx?pull=/library/en-us/dndotnet/html/linqprojectovw.asp

Interesting article.

Reading the description of the LINQ project shows that great stuff is being added to .NET, but IMHO LINQ should use standard SQL syntax to provide developers with a single learning curve. Beggars can't be choosers, but I hope VB.NET uses a more standards based approach.

The article unnecesarily complicates a very intuitive thing. Why use buzzwords like lambda expressions and expression trees? Keep it simple.