An interview with Peter Merholz and Nathan Shedroff on User-Centered Design (Digital Web Magazine) -- "Usability is specifically focused on "ease of use" and is a component of User-centered Design. User Experience can mean a lot of things depending on who you're speaking with but it should be the focus of a user-centered design process. The experience encompasses a lot of space, including 3 dimensions, 5 or more senses, time, emotions, social context, etc."