We finally found time to do some more work on Ping-O-Matic, and have implemented an XML-RPC interface. You can now send a standard weblogs.com compatible ping to http://rpc.pingomatic.com/ and we will ping a subset of our services. Currently, this is a fixed subset of seven services:
In the future, we will have ways for you to customize which services you would like us to ping on your behalf. Stay tuned!