I love good stories. And I really enjoy ad campaigns that tell a story, rather than simply sell a product. Examples are, of course, http://www.bmwfilms.com or the American Express Seinfeld Webisodes, which are apparently not online any longer. Admittingly, these examples are quite old when measured by digital standards.
There was another campaign, which amazed me. It was (is) the Sharp Aquos campaign, which presented three television spots showing one and the same scene, but from different angles – the angles of the three people involved in the story, which could be followed at http://www.moretosee.com/
More than that, the story unfolded across several fake websites setup by Sharp. In the story, Nathalie, Peter and Mike are searching for the whereabouts of three somehow really precious urns. On the web, everybody could join the search, exchanging thoughts about clues they got on these fake websites, all within a forum also setup by Sharp. It ran (at least in Germany) until the end of last year.
So this is also not a very new campaign being finished for the last couple of weeks, but for some reason, people still post their comments on http://forums.steinitzpuzzlers.com/index.php?s=ceb772b96ced472bdad18333d2e7a188&showforum=3

If anybody knows about a new campaign that is a good example of good storytelling, let me know!