You know what I would really, really, like to see?
Ultimate Toolbox Modern/Future.
These charts are great for fantasy, but break down pretty much completely for any other genre.
So an Ultimate Toolbox that could work for Spycraft, Twilight 2013, Westerns, 1920's Chthulhu, Traveller, Star Trek, Star Wars, etc... would be wickedly awesome!
You could make it cover more time periods by having it go from earliest time period like:
Colt Navy Pistol/9mm Glock/laser pistol/phaser in an entry for a weapon found, etc...
That way you would only have fewer charts dedicated to specific time frames in the book.
Anyways, if sales of Ultimate are strong, try and sell AEG on one for other genre. Like their Spycraft, etc...