Bloglines, a popular web-baed feed reader, has been experimenting with a new mobile interface (v3). If you want to try it, bookmark m.beta.bloglines.com/feedtree in Web on your phone. Changes are 'favicons' in the feeds list, a 'pin' system for marking things for later attention, auto-marking-read and breaking up long lists of uread items within a feed into manageable chunks.
Linear Mode
