NewsGator's ping endpoint

For those who are wondering how to ping NewsGator’s system when a feed is updated…the ping endpoint is

http://services.newsgator.com/ngws/xmlrpcping.aspx

It implements the standard XML-RPC ping protocols.

This has been up for ages, and is used by ping-o-matic, pingoat, feedburner, and others…but I don’t believe it’s actually documented on the site anywhere. So, rather than my having to dig around looking for it every time someone asks, this will hopefully get it google-able. :-)