I haven't done any gaming via Google+ yet, but I stumbled across an app someone is creating for Google+ that will add a battlemap and dice roller, among other things. It's called Tabletop Forge and it looks pretty nice so far.
I don't see anything on the site about whether there is going to be a price. Anyone know anything about that? I would like free, but probably wouldn't mind paying for a product I actually use (unlike Fantasy Grounds II, which became too cumbersome and had too may connection issues and was too pricey for new users).