Today Rockstar announced a new website called the Rockstar Social Club. Essentially a high tech leaderboard, the first supported game will be (drum roll) Grand Theft Auto IV (surprise!).
Compatible with Xbox LIVE and PSN, players can register starting April 15th to track all sorts of neat stuff they do in GTA IV when it's released April 29th. In addition to ranking players by time to single player completion, tracking the first to complete 100% of the game and singling out the best in a Hall of Fame, something called the LCPD Police Blotter will be a virtual map listing every single-player crime committed in Liberty City, ever. Oh, and additional lists will be aggregated of various "physical milestones" like miles walked and bullets fired.