Microsoft released Kinect for Windows samples under an open source license. You can find everything on CodePlex: http://kinectforwindows.codeplex.com/. There are total of 22 unique samples in C#, C++, and Visual Basic.
Few reasons behind this release are:
Browse K4W sample code right in your browser...
This is the list of all samples included in the latest Developer Toolkit release. The table lists the name of the sample, in which languages it’s available and what technologies and additional SDKs are used.
Available in 1.6.0
Audio Capture Raw
Depth with Color
Available in 1.6.0, Require Face Tracking
Face Tracking Basics
Face Tracking Visualization
Tic Tac Toe
WPF D3D Interop
Available in 1.6.0 Require XNA