Sam Ruby implements the RSS Trackback module in his RSS 2.0 feed. It’s implemented by simply including a “trackback:ping” qualified URI in the item. For the item that corresponded to his announcement of support, the URI is;
So being the Web-head that I am, I invoked GET on it. Here’s what I saw;
<?xml version="1.0" ? > <response> <error>1</error> <message<excerpt not found</message> /<response>
I note that Paul, Ben, and Mena had written about what could be returned, which is bang on from my POV, though you could also include the number of received pings in there, which could be useful, and make a nice link from the human-readable blog.
Just thinking out loud; I’m not trying to put more work on Sam’s plate 8-).