Firefox/Chrome/Opera: Right before Google announced Google+ the company changed the bar across the top of all Google pages black. That bar now has links to your often-used Google services, and the Google+ Enhancer user script makes it more useful by adding unread item counts to the ones you use.
Currently the script supports Google Reader, Gmail and Google Calendar. It simulates the look of the orange Google+ notification button on the far right of the screen. These numbers appear in between the links to each service on the left, and it's worth noting you'll need to be logged in to Google+ to see them. You'll need Greasemonkey installed or a browser that supports user scripts to use Google+ Enhancer.
Google+ Enhancer [Userscripts.org]