RSS 2.0 feed is implemented. ATOM is not yet.
You can also add on the optional category id,
http://help.lifewithchrist.org/index.rss?category=4605 for instance. This will get posts only under the development category.
Or, for ease of use, you can use the category URL prefix as well, for instance, to view the Development category of the Help blog, you are directed to:
development in this case is the URL prefix. So, you can access:
and that will also get a RSS feed for only posts in the development category.