Atom feeds

Using Atom for data synchronisation

• Microsoft SSE: Simple Sharing Extensions for Atom and RSS
• indicate deleted items: http://www.nabble.com/Handling-updated-or-deleted-entries-td12063666.html

Atom based Search subscriptions

• Wikipedia:OpenSearch
• A9

Atom based REST services

• http://code.google.com/apis/gdata/basics.html