Questionably Useful
Slow. Kludgy. No alerts when I get a message. Never keeps me logged in. Crashes frequently. Is just an HTML browser to G+ from my menu. Maybe thats all you want. Maybe you were thinking, "Gosh! I cant stand having G+ in a tab in Safari/Firefox/Chrome. I want it to be semi-accessable from a drop down menu that takes a bit of time to render and makes me log in all the time!" Then this is your utility. To be fair, Google hasnt opened up their API to devs so that we can have nifty clients like can (used to) be found for Twitter, but this app doesnt do much more than place a web browser in your menubar.
Sparky McMuffin about
Tab for Google+ Pro