... launch a new homepage for Google Blog Search so that you too can browse and discover the most interesting stories in the blogosphere. Adapting some of the technology pioneered by Google News, we're now showing categories on the left side of the website and organizing the blog posts within those categories into clusters, which are groupings of posts about the same story or event. Grouping them in clusters lets you see the best posts on a story or get a variety of perspectives. When you look within a cluster, you'll find a collection of the most interesting and recent posts on the topic, along with a timeline graph that shows you how the story is gaining momentum in the blogosphere.
I am not a big fan of the Google News, half search, half aggregation interface. Google should come up with some news interfaces to add-on, not necessary complete revamp, but some other visualization tools, like the visual key-word mosaics some sites have.