I've developed a native PlayBook app called Web's New that gives you insight into what people are finding most interesting on Twitter, Flickr, and YouTube all in a one consistent and easy interface (and without the need to have an account on any of these services). For example, with the recent Mars rover, it was interesting to see people tweeting about the Jet Propulsion Lab and reading what people had to say, and within the same interface go to Flickr and see that NASA had uploaded pictures of the rover parachuting down.
I hope you'll try and like it. Or if you have suggestions that might make this idea more interesting I'd love to hear from you (email me at [email protected])