Yeah, Serendingsbums is soooo great and can do soooo much with trackback. Unfortunately it only implements trackback autodiscovery (which is a dumb idea to begin with, which is why the Python Desktop Server naturally doesn't do it) and doesn't even have support for the trackback module in the RSS feed (which would make trackbacking posts from the aggregator easier, if the aggregator evaluates the trackback module - which the Python Desktop Server does, because it makes sense) ...
At Die wunderbare Welt von Isotopp you can find the original article.