A new Lego® website is born: Rebrickable.com
This easy to use website lets you compare your sets to other sets you can build. It includes almost all original Lego® models and it has a growing list of MOC’s. You simply select the model you want to build, and then select a number of sets you own. Then you can see how many and which parts you have and which parts you don’t have. It can make suggestions on which set has the most of the needed parts. My models can be found on that website as well.
Greatly reccommended for all you builders out there !!