I think it would be nice to be able to store your favorite !Bangs and categorize them. There's a lot of neat and amazing future ideas that can be done with the Bang feature.
Most Popular Bangs
Categorize Your Bangs
Show which Bangs You Use the most
Voice Activated Bangs
Bang and Tweet It
The Big Bang (Bang Multiple sites at once)
Just imagine all the wonderful and amazing things this one feature can do in the future!
Am I missing anything?