Killzone 3 - Killzone Universe Trailer | HD 720p

Game - Killzone 3
Publisher - Sony Computer Entertainment
Developer - Guerrilla Games
Platform - PS3
Released Date - 22 February 2011

Source
http://www.youtube.com/user/PlayStationBlogEU

The 3rd Birthday - Launch Trailer | HD 720p

Game - The 3rd Birthday
Publisher - Square Enix
Developer - HexaDrive
Platform - PSP
Release Date - 01 April 2011

Source
http://www.youtube.com/user/gamespot

Jurassic Park - Behind The Scenes : The Dinosaurs | HD 720p

Game - Jurassic Park
Publisher - Telltale Games
Developer - Telltale Games
Platform - PC, Mac
Release Date - April 2011

Source
http://www.youtube.com/user/TelltaleGames

Portal 2 - Aperture Investment Opportunity 2 : Bot Trust Trailer | HD 720p

Game - Portal 2
Publisher - Valve Corporation
Developer - Valve Software
Engine - Source
Platform - PC, 360, PS3, Mac
Release Date - 18 April 2011

Source
http://www.youtube.com/user/Valve