The new website for 10 Downing Street is run on WordPress (this blogging platform) using a customised Networker 1.0 theme, and has integrated Flickr, YouTube and Twitter into the side-bar. More information from here and here. If you thought that a blog was ‘just a blog’, think again.
It nicely demonstrates the versatility of WordPress as an all round web publishing tool that serves not just individuals but groups and teams of people. I expand a little on the collaborative features of WordPress here.