Google News Timeline is the second new services released today in Google Labs. According to Google, it's "a web application that organizes information chronologically. Google News Timeline allows users to view news, scanned newspapers and magazines, blog posts, sports scores, and more on a zoomable, graphical timeline."
The search box is very powerful, but you first need to pick a category from the drop-down. Google lets you add different sources: blogs, newspapers and it shows structured information from Wikipedia and Freebase.
Here's a simple way to visualize the list of posts from two Google-related blogs:
Using data aggregated by Freebase, Google can show some famous paintings by Claude Monet:
You can create interesting timelines using this services and it would be nice to save them or to have a permalink for future reference. Hopefully, the service will also add the option to use custom data sources.