Almost a Web 2.5 website in coolness - Timeline of the 2008 financial meltdown

This is an unreal site that a friend posted and allows you to zoom in to the day to day stories, all the way back to the 1900s, for the overall time line of events.

What exactly is Web 2.5? I have no idea. I just made it up. I'm still wrapping my head around the difference between Web 1.0 and 2.0, other than 'visitors can provide feedback and content'.