Microsoft has recently launched a promotional website for its new Windows Live Messenger application. "Communication evolved" features three funny videos, created by Maverick, which show how difficult life is (or would be) without the new platform. A part from the videos (which everybody call "virals") the site offers the possibility to download the new software for free (redirecting to Microsoft's website).
As said, I don't feel such videos are really viral, they are nice and entertaining, and work pretty well to promote the product, but just because they are amusing it doens't mean they are able to generate word-of-mouth. Sorry for the nasty judgment, but I'm now very picky when it comes to labeling a video as "viral".