This document discusses the concepts of Web 1.0, Web 2.0, and Enterprise 2.0. It describes how Web 2.0 enables an "architecture of participation" compared to the "architecture of partition" in Web 1.0. The document outlines some key differences between consumer-focused Web 2.0 and Enterprise 2.0, and notes areas of intersection around social computing. It also discusses the technology stacks that power Web 2.0 applications, including application containers, messaging buses, and enterprise mashups. Overall, the document examines how Web 2.0 is influencing business computing through more dynamic applications that reduce costs.