Hey skwilder ! Glad to hear this ! I think that the integration with events is the first obvious step. Depending on the Google API features, we need to know who attends the event, watches on-demand, time spent (it looks like YouTube -who handles the broadcast for hangouts on air- tracks the time people spend watching the stream). One remaining issue I have is to decide whether I drive attendees to one of my webpages (embed, and thus mkto cookies, no need for a Google account) or within G+ (with Q&A I can't easily implement on my webpages).
As a second step, I would investigate the ability to use hangouts for sales people (and then track for scores, interesting moments, etc...).
You know how we are, we want to track any meaningful signal 🙂