title: Know of any C# spatial data libraries?
body: <p>I'm looking at implementing spatial queries in .NET without using SQL2008.  The first requirement is to be able to create a (BTree styled) spatial index and be able to query it.</p>
  
  <p>Although SQL 2008 ships with .NET libraries for the types, you need to use SQL for the spatial indexes.</p>
  
  <p>Has anybody used any .NET libraries for spatial data (OS or commercial)?  I am looking at NetTopologySuite but it looks quiet and I don't want a dead library.</p>