For those of us who like to collect weapons it would be nice if Borderlands had something similar to Warframe which showed all the different Legendary items and which ones you found. The tracker would need filters for each weapon type, mods, grenades, etc. Items you do not have appear grayed out. Clicking on a weapon would tell you the stats (since all legendaries have the same stats), where to find the weapon (board, boss, however is the best to display this), and the highest level found.
Just an idea for those collecting people!