Haha yeah, apparently it's most PS3 owners too, unfortunately. http://www.ps3fanboy.com/2008/04/29/gta-iv-online-is-down/
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I managed to get online for 10 minutes before it went down again.
seems the servers are back online - or at least i can access the multiplayer menu from my phone now
Not been online yet, it all sounds good though
PSN - peskingmatt