This video has nothing to do with marketing, but I think it's a great example of taking something that is popular, something that people are searching for, and riding the wave of publicity and interest.
If you're looking for more traffic to your site and more exposure for your whatever you're doing, take a look at the Yahoo! Buzz Index. If you've got something close to what you see there, issue a press release about it via a distribution service like PR Web.
You've got to be quick when doing this. Time means everything when it comes to beating out all the major news services. But even if you're pretty slow, there are usually enough people looking for hot topics that you should be able to get quite a bit of free traffic.