Like in other social networks Google+ Stream is such a mess.
Particularly after using Google Reader. And this is with larger number of sources.
So i think need to add few "View settings" as All items and *** new items for the separation of read and unread posts on Stream. Add buttons Previous item and Next item to finally stop torturing the poor scroll wheel.
And would be great to have something like fullscreen mode View in Reader Play in Google Reader.
Also will be nice to view Youtube video in Google+ page via lightbox as photos now. Like here ( http://youtu.be/rgh-VNGJvoU ). Fullscreen with black background.
And the same lightbox for view Maps, StreetView, Docs, audio and every media which shared via posts in Google+. How people will be at Google+ page all time if you makes even watching Youtube via little window or at youtube.com? Bring more services into Google+. Not just a place where you will get the link and quit.
ps: May be with these buttons, we will have less white space..