Hitwise has released some statistics on the popularity of various web based feed readers.

The market share of US visits to Bloglines was 3 times greater than Rojo, its nearest competitive web-based feed reader. The chart below shows the traffic trend over the past year for the leading web-based feed readers. You can see that [...]

TechCrunch, a small blog network that packs a big A-list punch, has taken the collassal undertaking of ranking the feedreaders. 
Looking at online readers (bloglines and Rojo ranked best here) and offline readers (desktop readers like Feeddemon and NetNewsWire ranked well here), the articles goes the lengths and really delves deep to completely assess the [...]