cacoo and slideshare apps elevate virtual meeting space of google+

Using Cacoo for Google+ Hangouts, members can share diagrams during a live video chat. No matter how far the other members are, you'll feel as if everyone is in the same room with one whiteboard. - cacoo press release

"Arguably the two most practical new arrivals, SlideShare’s app lets Google+ users view presentations, documents and videos together, while +Cacoo supports wire-framing, mind-mapping and collaborative diagramming." -- Sarah perez, TechCrunch