Sam Ruby links to my O'Reilly RSS article and asks "Perhaps the RSS validator should optionally issue warnings (as opposed to errors) nudging people in the directions of best practices such as the ones that Tim has outlined?"
Needless to say I agree. As I've written in the past, being valid RSS does not guarantee that a feed's content is well-formed enough to be useful to an end user. Thanks to the loose design of RSS2 format that generally has made things worse rather then better, there are many perfectly "legal", but less then neighborly uses. It's why I drafted the XSS profile and its why I support such warnings being added to the RSS Validator.
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