You can patent that? Are patents on computer programs and business methods good for the new economy?

In other parts of the economy, firms are increasingly turning to patents to protect not just physical inventions but more abstract ones such as computer programs or ways of doing business. Just two decades ago such patents would have been impossible to obtain, let alone enforce. In "You Can Patent That? Are Patents on Computer Programs and Business Methods Good for the New Economy?" Bob Hunt describes the changes in patent law that have given rise to this phenomenon.