I've been thinking about writing website where guitarists/bassits could register their instruments as a way of keeping a sort of inventory/ownership tracking. The general idea is that someone registers an instrument with the serial number, uploads pictures, indicates where & when it was purchased, how much it was purchased for and the current ownership status of the instrument (currently own, no longer own, stolen). Further to this, anyone can search a guitar/bass by serial number and see the current ownership status of the guitar, who (as a username) owns the instrument and contact info if the search shows that the instrument was stolen. In terms of selling gear, if two users of the site proceed with a transaction to sell/purchase the instrument, ownership can be transferred to a user and the site would keep record of who has owned the instrument during what time periods, giving a history of the instrument. Other documentation could be added such as dates of service & modifications and such if that info interests anyone. It could also potentially be used by retailers and dealers to transfer ownership of an instrument to a user of the site for ownership tracking purposes and so on. If there's interest in building a site like this, I'll happily do it.