Rockstar Games has announced that Grand Theft Auto IV has shipped to retail, for PS3 and Xbox 360. Grand Theft Auto IV is powered by Rockstar's proprietary next generation game engine, R.A.G.E., allowing for an unprecedented level of realism and interactivity. The game is also using euphoria, a fully procedural animation engine created by NaturalMotion. You can already see a few people on Xbox LIVE already enjoying the game and unlocking achievements.