We use both of these features very heavily at Google, so I'm really happy to see them launch externally. The ability to restrict posts to within a company lets you create a corporate social network very easily (think Yammer, Chatter, etc.). One of the main complaints I hear about Google+ is that specific friends aren't on it, but that's much less of an issue if your company uses Google Apps. I spend a lot of time and get a lot of value out of within-our-company Google+ posts.

And since Google has widely distributed offices, I can't tell you how many video meetings I've attended, but it's a lot. Having the ability to join a video conference/hangout from a link in Calendar makes such meetings really easy to set up.