After having spent a week with Siri on my iPhone 4S, I’ve gotten to know the useful and the not-so-useful aspects of Apple’s “digital personal assistant”. Today, Siri is quite limited because it can’t interface with third party apps, nor can it carry on a real human conversation. When it’s able to do these two things, which is likely to be not too far away, the usefulness of Siri will increase dramatically. Imagine Siri being able to call your doctor for you to make an appointment, or having Siri buy something from Amazon on your behalf. The possibilities are endless.