Rich Internet technologies such as Ajax change the way the Web works, bringing exciting new possibilities to Web interfaces. But how do we give users a richer, more powerful interface without sacrificing ease of use? A common example of this challenge is product selection. Web sites that help users select products, services or content often use a variety of tools so that users find exactly the right item for their needs. Come see how we applied Ajax to this common challenge in order to create a rich interface that makes product selection easier (and more fun). We'll discuss how users expect these new interfaces to work and what usability issues occur when testing these types of Web 2.0 sites.