Knowledge Representation Timeline.
This is pretty impressive: A Timeline of knowledge-representation that starts at the dawn of the Universe and continues through the whole of human history right up to the present day.
[Simon Willison's Weblog]
Full of great little tidbits and things you didn't know you wanted to know. Nothing wasted on eye candy or user-friendly interfaces. Just lots and lots of data.
[
McGee's Musings]