I want this for publishing from Tomboy to Drupal (data.agaric), as Tomboy and AtomPub already work together: http://flukkost.nu/blog/tomboyblogposter/
Ancient interest in the forums, and no response:
Implementing AtomPub for Publishing Nodes? http://drupal.org/node/193167
Response from a maintainer of the now-in-contrib BlogAPI module:
Aggregate RSS/Atom news
Show news as list or on a map
Search news
Republish news by bundling articles into channels
Configurable location tagging
Configurable maps