As of June 2, 2011, I've updated my answer here:
For me?
SOCIAL MEDIA
- Twitter app. I use it all day long. I also use heavily the Facebook and LinkedIn apps.
- Hashable app. Is quickly becoming the way to trade info among industry insiders.
NEWS APPS
- NPR News. Nicely designed.
- CNN. Sometimes I watch CNN for live news reports.
- SkyGrid.
