LINQPad
Sorry if everyone else knows about this but I was scouring Scott Hanselman's "Tools List" for a Diff utility to help debug a weird JavaScript Intellisense issue I'm seeing when I stumbled across Query Express (I've been doing some stuff with a lightweight VPC with SQL Express and no Management Studio so this caught me eye to save me from sqlcmd) and from there I ended up at https://www.linqpad.net.
I've not had the chance to play with it much yet but one of the very first samples caught my eye (below) - I think that's a great demo "statement" and also the fact that the tool includes all the samples from the book "C# 3.0 in a Nutshell" written by Joseph Albahari, the author of LINQPad.
