Not that I know of. Gameloft said that they might have voice chat on NOVA but that didn't show up, I think.
It's possible although I wouldn't want a bunch of little kid bad mouthing me because i'm kicking their butts in Archetype.
I think one of the first ones - surprisingly - is Big Fish's Big City Adventure: San Francisco. Just out today for iPhone and iPad
Adrenaline Pool Online 2 has it (was the first game to implement it). However it was released a while ago and I doubt there are many, if any, people to play against.
Yeah....that's too bad. If you watch the keynote they said they would have it...guess they never got it working
Yea there was a lot of talk when it first came out that there would be an update with voice chat. I was never too disappointed, I couldn't even finish a game before losing connection.