• Optional and named arguments
• Pattern matching
• Active patterns
• List/array/sequence comprehensions
• Custom operators

• F# Cheat Sheet (Chance Coble)
• F#un with Phantom Types (part 2, part3, by Matthew Doig)
• Revisiting Memoization (Matthew Podwysocki)
• Questions and Answers – part II – Currying (Steffen Forkmann)
• Questions and Answers – part III – Lazy evaluation (Steffen Forkmann)
• Questions and Answers – part IV – Structural comparison (Steffen Forkmann)
• Lisp compiler in F#: IL generation (Tim Robinson)
• Prototyping DSLs in F#: Parsing and Semantic Checking (Adam Granicz)

• Introducing F# Asynchronous Workflows (Don Syme)
• Beyond Foundations of F# - Workflows (Robert Pickering)

The features lets you add units to floating values, so that don't compare (or add) a weight and a length. This provides static checking, using type inference.

[<Measure>] type kg    // define a new unit

4.<kg> * 2.<kg>        // returns 8.<kg^2>

• Units of Measure in F#: Part One, Introducing Units (Andrew Kennedy)
• Units of Measure in F#: Part Two, Unit Conversions (Andrew Kennedy)
• Units of Measure in F#: Part Three, Generic Units (Andrew Kennedy)
• Units of Measure in F#: Part Four, Parameterized Types (Andrew Kennedy)
• Les unités de mesure(fr) (Laurent Le Brun)