Looks like Grand Theft Auto IV got a little band-aid patchwork today with a 1.01 update. It's a small little tweak at 18 MB, and it supposedly will fix up those freezing problems everyone's been getting antsy over. So far, we've been playing with the new patch for the past few minutes and everything seems to be going smoothly.
[Update: Looks like the freezing issue has not been fixed after all. Many gamers are stating the problem is persisting. Apparently, this update is supposed to fix multiplayer connectivity issues which cause the game to lockup. Eurogamer notes: "reducing the loads on the servers at GameSpy and hopefully the completely random hangs that some users have seen".]