The Visual Lego software project allows you to gain full control of your NXT brick via .NET (Visual Basic, C#, etc.). This software wrapper allows you to access all the bricks functionality over the serial bluetooth link. The library, written by Bram Fokke, is almost complete. It can be downloaded
This is a companion discussion topic for the original entry at https://community.robotshop.com/blog/show/control-your-nxt-brick-using-net-and-bluetooth