In France, Warner Bros has launched an advergame to promote the launch of the V for Vendetta DVD. As Guillaume wrote, the game play reminds of Streetfighter, but unfortunately is not as engaging.
If you want to give it a try, this is the link to follow, and you can even win a Collector's edition version of the DVD. Bear in mind your winning chances increase if you refer some friends.
If instead, you prefer to enjoy the original cominc-book by Alan Moore, you can find it on Amazon, it's half price at the moment :-)