Creating building instructions for NXT robots can be a lot of fun. And it’s a great way to “preserve” your robots after you’ve taken them apart. There are now a variety of ways to create virtual NXT robots and building instructions, but a quick and easy way to begin for either Windows or Mac OS X users is with the official and free LEGO Digital Designer (LDD) software. Since the capability to create NXT robots with LDD is relatively new, there are still some bugs to work out. But it does work. Version 2.3 of LDD was recently released, and you can visit http://ldd.lego.com/ to download the latest version.
Note that I did not use LDD to create the building instructions in The Unofficial LEGO MINDSTORMS NXT Inventor’s Guide. Rather, for my book I used a set of tools based on the LDraw system.
this is soo cool!