Well, that's not really fair, because Siri isn't designed to try to have a conversation -- it's designed to just get a few things done easily via voice commands

Well, that's not really fair, because Siri isn't designed to try to have a conversation -- it's designed to just get a few things done easily via voice commands. The state of the art in chatting is probably something more like Cleverbot, which is way, way better at having a conversation than Eliza. (It occurs to me that hooking Siri up to cleverbot would be pretty awesome...)