Open Services are gaining momentum on the Internet, and will surely be as integral to the Net as Open Source. Open Services are in fact the network-enabled analogue of Open Source. The idea is that the combination of ease-of-use and the low cost and availability of computing and network capacity makes it possible for everyone to run a server or provide a network service. Many of which will be "open" or shared. Examples today are obvious. Napster, Gnutella, FreeNet, SETI@Home, 802.11b, and on and on. Tomorrow, set top boxes and other Net-enabled items will use each others' published services. The challenges facing this growing phenomenon are beginning to show. Privacy and security concerns on networks; legal concerns regarding what you do on your connection, particularly in light of restrictive ISP user agreements; technical concerns on interoperability, etc. Open Services gives name to the practice. It subsumes P2P, as P2P is a particular approach to network Services, many of which are Open. In the same way "Open Source" provided a simple message and stable footing for "GPL" and "BSD" products, Open Services is a good social descriptor for many technically similar, but different concepts (Web services, file sharing, server sharing, shared network provisioning, decentralised networks, hybrid networks, centralised systems, and on and on).