NewsTrends - See the pastGoogle's new archive feature allows you to search news from 1900 onwards.
I just put together this site, which tries to see how much media interest there was in particular subjects by finding how many results there were in a set of time segments compared to how many total results. Lots of pretty graphs like this one (for 'blog'):
I'm looking for suggestions for more graphs to draw. If you've got any, please leave them in the comments here! There's an RSS feed, so if you subscribe you'll see whenever I add new things.
The site's pretty ugly right now; I hope to deal with that shortly.
Digg it here.