One of the key differences between AI and HCI research is that AI measures success in terms of more effective algorithms, whereas HCI focuses on improving interaction and enhancing human skills over time. I argue that better AI algorithms are neither necessary nor sufficient for creating more effective intelligent systems. Instead, we need to create human-computer partnerships that take advantage of machine learning but leave the user in control. I describe several projects that use generative theories of interaction to design intelligent interactive systems that users find discoverable, expressive and appropriable.