Hi Blake,
As discussed with Michal via emails, there were some conclusions about problem in RSSRepeater and suggested workaround with specifying DataSourceControl property instead of DataSourceName (which doesn't seem to be working properly in ASPX templates), however I still want to make sure what's exactly your aim.
I believe you want to display the list of news from ada.org RSS as normal list of items on the page, is that correct?
For this, you would just need to correctly set "Table name" property in the XMLDataSource webpart. In case of standard RSS feeds eqqual to "item". I'm describing it in
this thread.
However, the problem here might be also related to the colon in tag name (e.g. <atom:link...>), which was fixed in recent hotfix release.
Please let us know what have you found and if my assumption matches your aim.
Regards,
Zdenek