“groovy mother...”

Google Calendar has an Atompub-based API.

Ning are sharing out all the user-generated data as Atom feeds, and will soon be supporting Atom Publishing to modify data. Hooray for non-roach-motels.

Cool stuff (in a gloriously uncool way). A servlet to handle remote Lucene queries which is based on Atom-Pub, XOXO and OpenSearch. Hooray for well-defined standards which will speed up coding.