Over the past year or so I have been doing a weekly categorization of the following Xen.org mailing lists:
Each mailing list is updated on a weekly basis in a variety of categories to assist you in looking for answers to questions that you have and may already have been answered. You can find the complete set of weekly tracking at http://wiki.xensource.com/xenwiki/XenWeekly. Each week contains the complete set of emails for that week as well as a listing of all the updated and new pages in the Xen.org Wiki.
You can also do a nice, simple search at http://xen.markmail.org to find your information from all available Xen.org mailing lists emails. The MarkMail database will search every email that has been sent on all the mailing lists to find your information. Additionally, you can review common Xen issues/questions in the wiki at http://wiki.xensource.com/xenwiki/XenCommonProblems or http://wiki.xensource.com/xenwiki/XenUsersQuestions.