Kindle Fire nailed the obviousness of this with the top bar being labeled with Movies, Music, Apps, Books, Web.
Nexus 7's home screen widget is a poor attempt and trying to shoehorn media discoverability into an OS that isn't built for media consumption, it's built for phones primarily.
You could make the same arguement for iOS, but iTunes has already trained users that you go to iTunes to get content or you go to the obviously named App Store.
Make it easy, make it obvious. Nexus 7 is a small step in the right direction, but it needs work.