LINQ let Keyword (How did I miss that)

This is strange, because I've been working with LINQ for almost 2 years since (March 2006 CTP), and I've never noticed the new keyword "let" which is used inside LINQ queries to create temporarily variables.

check this out

var list = new List<int>() { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

var query = from i in list

let j = i + 2

let k = j * j

select new { i, j, k };

As you can see the let keyword was used to create two new temp variables (j, k) which their values were calculated inside the query.

Looks nice, doesn't it