F# is a functional programming language in the ML family of languages. It runs on Windows, Linux, and OSX and is fully open source under the Apache 2.0 license. F# can be used to write all sorts of applications, and it's popular in quantitative finance, scientific programming, asynchronous programming, and anywhere you need to write succinct and correct code. In this talk, we'll discuss three cool things about F#: 1.) "Type providers" in F# 3.0 grant strongly typed access to data sources such as Wikipedia and REST services. 2.) Asynchronous programming made ridiculously easy. 3.) F#'s support for creating Domain Specific Languages (DSLs). No prior knowledge of F# is required. If you're intrigued by Scala, Haskell, or Clojure, you'll likely feel at home with F#.