Why would you want a gazebo when you could have a number of tree pods in your own back yard? A Canadian company in BC has developed 'Free Spirit Spheres' which let you live your dream of living hanging out in a pod house. The company markets them as being cool for relaxation, meditation, photography, and bird watching.
The company's site notes, "Spheres can be hung from the trees as shown or from any other solid objects like buildings or rock faces. A web of rope is connected to any strong points available. This replaces the foundation of a conventional building. A suspended tree house uses the forest for its foundation."