Sony have said that a multiplayer patch for the PS3 version of GTA IV will be released today and will help by "reducing the loads on the servers at GameSpy and hopefully the completely random hangs that some users have seen".
i got the update when started the game earlier. i didnt have any problems before now, so i hope i dont end up with any now that i have updated. i aint played online yet, so dont know if this is what the patch fixes or not.
im only going to play online when i get 100% complete.