Atom can be used as a WeblogPing API in alternative to the old school XML-RPC method.

How ?

Just post Atom top/feed level elements on the PingServer :

POST /AtomPing HTTP/1.1
Content-Type: application/x.atom+xml
<?xml version="1.0" encoding="utf-8"?>
<ping version="0.3" xmlns="">
        <title>dive into mark</title>
        <link rel="alternate" type="text/html" href=""/>
        <link rel="alternate" type="application/x.atom+xml" href=""/>
        <link rel="alternate" type="application/rss+xml" href=""/>
        <tagline mode="escaped">Every time you use TypeKey, God kills a kitten.</tagline>
        <generator url="" version="2.66">Movable Type</generator>
        <copyright mode="escaped">Copyright &#169; 2004, Mark Pilgrim</copyright>
            <name>Mark Pilgrim</name>