Guild Wars 2

The idea is basically an extra tab on the hero window which focuses on weapons instead of armor. Classes can put 2 weapons of each type and of each hand into their load out to accommodate wanting the same weapon but with different stats for their weapon sets (So for example a warrior would have 4 sword slots, two for off, two for main). Classes that only get one weapon set such as elementalists and engineers would only get one weapon slot per hand per weapon.
From this window you would select two sets of weapons to use in combat (or one for elementalists and engineers of course) and while out of combat you can mix and match as you choose.

I feel like something like this would save a whole heap of hassle in trying to manage our inventories and accidentally vendoring gear because we swapped from dual wield to a two handed weapon. Thoughts?

Edit: I may not have made this clear, but when you put weapons into the loadout, they are moved there from your inventory in the same way they currently do for being in your weapon swap slots