Impulse doesn't care where you got the programs, you can keep them side by side.
Minimizing Impulse to the Impulse dock I can quickly access all my stuff.
Impulse's community features are extremely advanced. Friends lists (which work back and forth with games), blogs, tracking, user ranking, etc.
My Friends list. Also coming soon: Facebook integration.
Live chat features about your favorite games, apps, or whatever else.
Impulse is a digital distribution platform. But its store also supports sending users a boxed version too (for participating publishers).