Reader now has subscriber numbers

This means that the creator of a feed can find out how many, if any, people are reading their stuff. Congrats to Google for letting us know the great difficulties they overcame to provide this service:

...with all the products that use feeds at Google, corralling the data in one place was like herding cats. So herd we did, and as of today, our crawler reports the number of Google users subscribed to the feed.