The Internet relies upon interconnection between various Internet Service Providers.  Historically, regional ISPs paid backbone providers for transit service, and backbone providers made settlement-free peering arrangements between themselves.  However, as regional ISPs have gained their own backbone networks, such arrangements have been in flux, and it is no longer clear who should pay whom and for what type of interconnection service.  Disagreements between interconnecting parties have sometimes resulted in insufficient capacity at interconnection points, and consumers have suffered from the resulting congestion.  In this talk, I will discuss technological, economic, and legal aspects of IP interconnection, and suggest a framework for evaluating such tussles.