When you have a lot of folders, with many feeds inside, sometimes you click on the feed name of a particular post, causing the UI to show you all posts that are from that feed. Unlike Google Reader, though, once you're looking at a single feed's stream of posts, you cannot see how many articles/posts are in the feed.

For instance, I have a folder with tech blogs. Sometimes are viewing a few posts, I click on the Slashdot feed, singling it out. The Old Reader UX does the right thing and shows me all Slashdot posts. It even shows me the Site Name, the feed URL, and Feed Title. But it doesn't show me how many posts I'm looking at in that feed. Google Reader shows the current number of posts in every view, but Old Reader doesn't. It would be great to know how many posts are in the Slashdot feed I'm about to read.