When it happened to me last year, I wrote an RSS feed keyword trend analyser in my new-found free time. Over a year and several million keywords and phrases later I can find associated keywords and phrases and plot graphs for almost anything that's been in the UK mainstream news. Like this one, showing the fortunes of three Labour party leaders over the past few weeks.
You can clearly see Tony Blair's book launch as the blue hump in the middle, and Ed Miliband's election as party leader in green on the right. Meanwhile Gordon Brown bumps along in the obscurity of his Scottish constituency as the red line. Funny that, the colours were allocated at random by my graphing library yet Blair got the Tory blue.
As a search engine marketeers tool it's of limited use unless you really are looking at up-to-the-minute trends for very fast moving content. But as a toy, or for finding collocated words and phrases for newsworthy themes, it's shaping up pretty well.
I'll be dipping back in to this particular well of words again on here from time to time, both from the tech side and just for the joy of playing with some words.