Neat. First though just looking at the screenies, give use numbers in the tabs...
[Normal (12/30)] [Shards (16/20)] [Keys (5)] [Ammo (3154/3200)]
Maybe give options to show as used/total, free/total, free#, free%, used#, used%
The current plan is to stick that information into the tooltips for each tab. I'll try and stick in a current count for shards and ammo though.
Oh and needs some access to the actual bags, for upgrading and the like.
I didn't cover it in the screenshots, but: