Fourth-year students run their own software house, in which they carry out real projects for real business clients. This year we have introduced them to Extreme Programming (XP), and in this chapter we examine the initial impact that XP has had on their business. The philosophy has been adopted with much enthusiasm and seems to have delivered in a variety of contexts, including maintenance and new projects. Some plans for a more rigorous experiment looking at the possible benefits of XP are also described.