Now that’s stupid, but I see headlines with both versions: Google Plus and Google+. I actually don’t know which one is official (or maybe both are?) and recommended to use, but I noticed one thing. Some tools tend to cut out the + or replace it with a whitespace.
What tools do I mean? Mainly those that people (may) use to tweet about you article or blog post. Usually the title becomes the tweet’s body, so it would be nice to keep it the way it’s supposed to be and not require correcting it.
So despite being 3 chars larger, my choice here is: Google Plus. At least for titles ;)
Finally managed to change the layout. I hope you’ll like it like I do - and I find it pretty clear ;)