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

Not my design but I've used it a few times, a typed-switch statement: http://community.bartdesmet.net/blogs/bart/archive/2008/03/30/a-functional-c-type-switch.aspx

Saved me so many if... else if... else if... else IF! statements