And not that long after the port of siri to the iPhone 4, @rpetrich has gotten Siri Ported Over to the iPhone 3GS.

The article also has a list of why he can't legally distribute this or disclose how he did it, or at least legally. Bummer, but it's nice to know that it's not a hardware limitation that restricts Siri to the iPhone 4S (not surprising to anyway, Apple is a hardware company after all), and knowing the internet this probably will sneak out into the wild at some point.