[lhnn]

As someone who hasn't tried Google+:

Is it implemented as a UI of Gmail, or is it its own site?

[scarmig]

Own site. Vaguely similar to Facebook, but less "formish" and more interactive. Black bar at top.

[golgo13]

I now have the black bar at the top, too. But I am not using Google+. I wonder if the black bar is getting rolled out to everyone.

[gchucky]

Yeah, they are. They wrote a post about these changes; see http://googleblog.blogspot.com/2011/06/evolving-google-desig...

[nextparadigms]

It is. It will be on all Google's properties. You won't see anything about Google+ on it until you get an invite or it goes public, though.

[esrauch]

No black bar on Youtube