John Hancock (www.johnchancock.com) is a Senior MCS consultant with a background in building, and writing about, .NET apps.  He has recently been working with Groove, and published a great article on MSDN about  integrating Groove with a custom .NET Framework application.  You can download the code sample, or Explore the sample code online.  The code download is available here: Groove2007_05.exe (524KB).

Link to this page: http://blogs.technet.com/groove/archive/2007/04/14/how-to-integrate-groove-with-a-net-framework-application.aspx