My favorite is the World Affiars section (check out the section on the pope). The Nature section consists, unfortunately, mainly off bad news.
Google has the not so well-known Zeitgeist project that looks at what’s going on through the spyglass of searches. They just released the Zeitgeist for 2005, as the end of the year approaches. It shows how the search for Weapons of Mass Destruction correlates with the US presidential elections, or how Wikipedia gained momentum this year.