First off: Great responsiveness on the API token removal. Thanks!
Second, Feedback:
1) Not having Greasemonkey is a deal-breaker. (I'm not the first to say it, but it's true).
2) The thing is slow in calculating post-rank for posts it presumable has never seen. Slow enough that it does not yet save time for me in Google Reader.
3) You're overall idea is excellent
4) What I'd like to see: Have a personal component to ranking. I.e. Every time I star a post in google reader, share a post in google reader, actually read a post in google reader, click through to the post in google reader, take note. You can use those for your post ranking, if you'd like. Then: integrate stats from this with the Google Reader Trends page. Give me stats on my different feeds based on the actions i've mentioned. This would greatly help me in feed managment decisions. Feeds that I've had for a while and have never received such a positive action (or few) would become candidates for deletion. Feeds which have a high number of such actions would be candidates for promotion to a higher priority folder. (I have various levels).
5) Thx for your work. RSS feed/post prioritization tools are desperately needed.