"Pheed Read" is released quarterly by Pheedo and details trends in RSS usage. This new one (only available in PDF – doh!) is not terribly good.
But don't miss the previous two Pheed Reads which are superb and useful:
- "Pheed Read" No. 1 – report on the state of RSS advertising
- Pheed Read #2 – Standalone RSS Ads Perform, Ad-to-Post Ratios Clarified