Web analytics, 2.0 style
Customize your dashboard so you only see the data that you want to see.
Popular data can also be viewed as a "Tag Cloud", for a fully certified Web 2.0 experience.
The main approaches fall into the following categories:
Personalized recommendation - recommend things based on the individual's past
behavior
Social recommendation - recommend things based on the past behavior of similar
users
Item recommendation - recommend things based on the thing itself
A combination of the three approaches above