My Polaris was stolen last season and I'm still looking for it. I recently spoke to a sheriff and he showed me a nationwide database police officers started for registering property or posting it lost or stolen. I looked at this and I think it's a great idea. I called these cops and they are definately on to something.
The database is Juststolen.net and I have attached a news story:
cbs4boston.com - Web Site Helps Victims, Police Track Stolen Goods