Mark Pilgrim: "You see, most RSS feeds suck."
Amen! Mark laments the sad state of most RSS feeds' compliance with specifications and consistency with each other. In response, he's developed an "ultra-liberal RSS parser" in Python that attempts to handle many of the common mistakes so news aggregators and other automated agents don't simply "choke" trying to process large numbers of feeds.
I've been experimenting with ways to streamline my intake of blogs and news using Rael Dornfest's blagg. While I've achieved a certain level of success issues from poorly formed feeds persist.
We can do better and must. RSS feeds are simply too useful to do otherwise.