Now that may be a good website, but I see a couple of problems. First, you have to register and then enter the information on everything you own before it gets stolen. Why would you want to do that if you can just keep all those records yourself? Then if something gets stolen, will your police department know about, or ever use, that website? If you have the information on your items; i.e., make, model, serial number when you report something stolen, police departments nationwide will enter it in the NCIC (National Crime Information Center) and your state may have also have a similar database, as Texas does; the TCIC. And when an officer anywhere in the country runs a check on an item he/she thinks might be stolen, it checks the NCIC.
The only benefit I can see to that website is for you to have "off site" data storage. If you're just keeping the information yourself, it could be lost to a tornado, fire, burglary, etc.
Am I missing something?