With GTA IV less than two weeks away, Rockstar has launched the Rockstar Social Club, which will have a ton of interactivity with GTA IV.
Check it out and get your account created.
"The Rockstar Games Social Club is now open for pre-registration. This is a members-only destination for leaderboards, statistics, tournaments, ongoing special competitions, virtual events and more for Rockstar titles beginning with the launch of Grand Theft Auto IV on April 29th. Register your membership now to set up your profile and ensure that you will be able to check your stats and participate on day one of game release."