The list of newest wiki articles can be found at: http://social.technet.microsoft.com/wiki/contents/articles/default.aspx?QueryType=New&PageIndex=1
1. Go to the Article Spotlight page
2. Clik New Pages.. The RSS feed for "Technet Articles" includes both new and changed articles (new because they have been changed): http://social.technet.microsoft.com/wiki/contents/articles/rss.aspx