Each post now shows a list of everyone that liked or reposted that post below it. Here's an example.

Also, as mentioned in the "quick update" post, the public feeds and blogs now support keyboard controls similar to Gmail that let you quickly jump from post to post -- hit the letters "j" and "k" to jump to the next and previous post (the left and right arrow keys will do the same thing). Thanks to @ikari for providing the initial implementation of this.