Matt Gemmell:

We act as if we take concentration for granted, yet everyone has had trouble keeping their mind on the task at hand. We litter our menubars with icons, keep notifications enabled, and run our email programs, chat apps and social media clients all day. Something’s got to give, and invariably it’s our creative output.

This is why I like the Notification Center so much. It’s not perfect, but it does allow me to see at a glance what’s coming in and if I need to deal with it without leaving the project I’m working on.