Coolest C# LINQ/Lambdas trick you've ever pulled?

Question

Saw a post about hidden features in C# but not a lot of people have written linq/lambdas example so... I wonder...

What\'s the coolest (as in the most

Answer 1

The LINQ Raytracer certainly tops my list =)

I'm not quite sure if qualifies as elegant but it is most certainly the coolest linq-expression I've ever seen!

Oh, and just to be extremely clear; I did not write it (Luke Hoban did)