I'd highly recommend checking out docker as the next cool tech to get your geek on. Vagrant and Boot2Docker are two options if you're not on Linux.
During a talk I gave recently, the topic of whether containers could talk across different hosts came up during Q&A and I mentioned this really cool project which basically enables distributed computing leveraging docker:
also check out coreos:
mobile virtualization will likely be coming along in the near future considering the fast pace of innovation:
All kinds of action happening in the management/orchestration space above docker: