NASA has released the Program For Viewing Planets for their cool 3D viewer program, with graphics and panning of venus, earth, mars, jupiter, etc. Its Open Source, written in C# and I will port it to VB and start making addons.  Get The Source Code in C# from NASA HERE... its also on SourceForge.net have fun!  Addons and data download packs to use for offline games and stuff are HERE.  IT'S ALL FREE.  Wow, this is gonna be cool, too bad they are thinking about switching to Java instead of .net 2.0... bummer, but cool we have the C# source code :) :)