Best Tablet Apps?

I have an iPhone and an iPad. I've been living in the Apple ecosystem for a while now. I was just gifted a Nexus 7 by a friend.

I've had several Android phones, but never any Android tablets. question is: Are there any good tablet apps for Android? I've been looking around the store. I haven't really found any good apps, or even a way to tell what apps are optimized for tablets.

So, I ask you guys...any suggestions for good tablet apps?