The Google+ Mobile Site just added a couple of new features to their repertoire with a new update. The new features are:
  • “What’s Hot” stream = you can check out the most interesting content being shared on Google+ with a quick flick... you just swipe to the right of your Circles stream.
  • The ability to see who +1′d a post = to see who +1′d a post, just click on the +1 count underneath the post
These are pretty nifty features they added. Supposedly, they plan on having the same features for the Google+ App very soon too.

Source: TalkAndroid and Google+ - Google+ Mobile