In the last few years, technology-savvy librarians have begun turning their attention to a host of new tools to connect with their users and colleagues. The umbrella term for these new technologies--Web 2.0--began gaining traction in 2004. Many librarians were quick to embrace the new wave of technology. Early adopting libraries used blogs to initiate contact with their patrons, wikis to collect information, and social networking sites to connect with each other and their communities. Among the extensive discussions revolving around best practices for implementing Web 2.0 tools in public libraries and the multitude of examples of how to reach out to users via these new technologies, there seems to be no discussion about "how many" libraries were adopting 2.0 technologies or how those libraries differed from their peers who were not venturing down this path. The author presents a study titled, "U.S. Public Libraries and the Use of Web Technologies," initiated by Colorado State Library's Library Research Service (LRS). The LRS's study aims to determine which libraries were adopting 2.0 technologies, how "successful" those libraries were, and whether adoption of these technologies was contributing to that success. The results of the study are discussed. (Contains 3 figures.)