A few video trailers

Half life 2 - Free yourself
This was a trailer for the mac release of steam. This also advertised the game Half Life 2 now being available to play on Mac computers

Team  Fortress 2 - Apple Mac trailer
This is a trailer for the Mac release for steam. This also showed a sneak peak of new items within the game

Team Fortress 2 - Meet the Engineer
There are several 'Meet the' trailers for the game team fortress 2, these trailers show the personality of the class that you can play within the game. These trailers have been a huge hit for fans as they are fore most
comedic and then secondly about the game itself. There are a few other trailers from TF2 (Team Fortress 2) that i will be putting within this post that i believe show the trademark signs of a good advert

Team Fortress 2 - Meet the Medic
This is the latest trailer from valve, unlike other trailers this shows a small narrative within the trailer of the medic and how he tested out one of his in game abilities. These sort of trailers show the small back story to the game and it can be said that this trailer was more fan orientated rather than for a newer audience

Team Fortress 2 - Meet the Sniper
This trailer unlike the last is a documentary spoof narrative to it. This can be said to be for a newer audience but still have a very comedic and interesting hook to the narrative.

Super Meat Boy - Teaser trailer
This trailer shows the game and the narrative within it. This is a trailer made with actual game footage rather than the specially made (with some game footage mixed in) TF2 trailers