Links for 19-Jan

Building WCF services in F#.

Formatted output for debug print statements  in F#.

Unit testing WF services.

Astonishment Principles and Framework Behavior -- XMlDocument vs XDocument.

Showing Calendars in out-of-office messages with PowerShell.

IEquatable<T>, Equals() and GetHashCode().

P/Invoke in PoSh.