With a focus on personalized news, Zite uses the twitter and delicious APIs to deliver a unique news aggregating experience. 

Zite feels less like a traditional news experience (flipboard tries to recreate newspaper/magazine reading) and more like curated rundown collected by a personal assistant. 

Price: Free.
Ads: None (publishers add them soon)
Content: ★★★☆ (3/4 stars) - Twitter, Google Reader, and Delicious API, but no Facebook integration. Content partnerships took a hit after cease and desist letters from The Washington Post, AP, Gannett, Getty Images, Time, Dow Jones. (source)
Endgame: A rumored $10 million CNN buyout came to went down Aug 31, 2011.

What’s missing: A more simple way to share topics or stories with friends. A CEO the responds to student inquiries and timeliness of this post on my part. 

A screenshot of the Zite home screen:

A screenshot of the Zite section screen:
 

A screenshot of the Zite story screen:

The Zite preview video: