I'm just putting the finishing touches on http://greenj.am - it has been build with Hybrid using the skeleton theme as a starting point.
There are a few interesting things going on, as posts come in from various feeds they get sent to OpenCalais where they get tagged by who or what is talked about. I then put the tags into about 12 custom taxonomies (people, places etc) and the posts can all be browsed by these tags.
I'd be interested on peoples views about the site and how it works. There is more functionality to come, particularly with stats and views of what topics are popular.