Hi Matt; I used the following article here: http://blog.mastykarz.nl/creating-rss-feeds-sharepoint-2010-content-query-web-part/
to do just that, theres also this article by Waldek which was pretty good in pointing out a few configuration chages to be able to do it as well: http://blog.mastykarz.nl/creating-rss-feeds-sharepoint-2010-content-query-web-part/