LabVIEW for LEGO MINDSTORMS (LVLM) is a powerful new programming environment developed by National Instruments and Tufts University CEEO. The NXT Module is an add-on for LVLM that gives you new ways to program and control the LEGO NXT brick. The NXT Module includes polymorphic VIs to give users the power of LabVIEW quickly and easily. The NXT Module and LVLM support powerful debugging options and the ability to create computer-based user interfaces for NXT creations.
To get started and to see examples, read the 'LabVIEW NXT Module Help' located under the Help menu in LabVIEW.
Also see Getting Started with LVEE.