I wasn't really happy with the Atom feed generated by Roller by default. There are a number of things that it is doing incorrect (e.g. using <title> with escaped html markup without specifying type="html"). So, I just rolled my own and included a few enhancements. The new feed is located here. The new features include support for my Feed Thread extension (every entry now has it's own Atom feed for comments), an hCard embedded in the Author element, and appropriate type="html" attributes on the various title, subtitle, rights and content elements.
Note to the developerWorks folks: it may make sense to use this new Atom template as the basis for all the blogs.
Improved Atom Feed