New entrant Syndicate IQ heightens the need for RSS measurement
The system is able to accurately track the dailey circulation of an article by inserting a unique identifier in the feed url and tracking IP and browser type. Like Pheedo and RSSAds SyndicateIQ will be launching an ad network shortly.
From their monetization page:
Syndicate IQ leverages the unique characteristics of syndication while enabling the sophisticated targeting, customization, and optimization found in other marketing solutions such as ad serving and email delivery services. Our Trigon Engine allows content publishers to monetize syndicated content intelligently while deepening their relationships with their subscribers and growing their subscriber base.
That would seem to me to be a great next step for the monetization of feeds and the standardization of useful metrics for publishers - will be watching with interest for more from them...