An update website prioritizes updates available for an application (e.g., a word-processing program or a fault-tolerance program) running on a user computer system. Prioritization is in part a function of usage data gathered on the user computer system by a usage-tracking module of the application. The usage data is transferred to the update site and parameters relevant to prioritization are evaluated. The parameter values are then used for prioritization. The usage data can also be compiled with data from other users to guide further development of the application.