The explosion of interest in peer-to-peer has produced a crop of companies promoting different approaches to distributed computing. In this panel, the CTOs of the four leading distributed computing companies, each with distinct backgrounds and experiences, discuss the approachs they've taken to architecting their platforms. What problems are they trying to solve? What technologies have they used to further their efforts? Over time, will their efforts coalesce into a common standard? The choices these leaders have made apply to every peer-to-peer developer, and this is the ideal forum to learn from their experiences.