Contextual grouping for Google searches?

Tony came across this when looking for information about Windows SharePoint Services. It looks like google is trying to do some sort of grouping by topic in the search results.



One slight problem is that if this was supposed to be grouping by topic, it didn't do very well.
We were discussing at work the other day about how interesting Flicrk has done segmentation of photos in their clustering (example: http://www.flickr.com/photos/tags/architecture/clusters/).

Web 2.0 is upon us.

Edit:
Alex Barnet has a post about Microsoft Research doing even more extensive clustering on thier search results.