How can I track application status with Private PAIR?

Private PAIR is in the midst of adopting XML technology which will allow Customers to directly download application bibliographic and status data. However, full deployment of a web interface will not be possible until some time in the near future. Private PAIR currently offers applicants many new features including several XML data download options. There is an XML download file containing an extensive list of bibliographic and status information for single applications; users can also obtain a list of applications with status changes which is updated daily; and finally a list of outgoing correspondence and reference documents, updated daily, isavailable. Customers are encouraged to begin using the new XML download files. Each of the three file types has a corresponding W3C (World Wide Web Consortium) schema file available from the USPTO web site.

USPTO FAQ - Questions and Answers (07DEC2007)