Ok, interesting project. I just added a couple of my systems.
Found a slightly annoying thing (bug?) too. Seems I can only update information about one system at a time. When I press one of the 'Update' buttons, the information for the other system is wasted. Should be fairly easy to fix.
I like the idea of attached pictures, as with c64preservation.
Would also be interesting with information like where the system was bought, cost etc (if available).