I just went over that marvelous site called Queenpedia once again and I just can't get enough of it. It's outstanding! Kudos to Erin, Pieter, Lester and all the other contributors.
I was in the way of creating a database with all my Queen releases and then I remembered Queenpedia, saw it and had an idea for a possible future expansion to that site. That page already has a database of roughly every Queen release in the world.
What if users could register and "create" their collections online? Report what you just bought, comment on each release, how to identify which version is which, "wanted" lists, items for sale, etc.
Obviously, it would lend itself to a lot of "pissing contests", people bluffing/lying and all but it would be very cool to compare what we own to what's out there. To get a user you would be required to prove your identity somehow to avoid duplicity or bogus accounts.
For instance, I noticed I own ALL of Queen's 12" singles released in Mexico (yay!). It's not much, as there are only 4 listed, but it was still interesting to know.
Also, a price guide similar to what QueenPictureHall and then Gr8kingrat's site had would be nice as well.