I've done this to some degree. My suggestion would be to build a product that throws off income rather than try to support yourself through remote contract work. A desktop app, iPhone app, subscription web app, or even ad supported web app. This will probably make your life better even if you aren't traveling.
+1. Consulting requires a sales pipeline. If you have a good network, that might fill the pipeline for you... You certainly don't want to be competing on oDesk and the like from abroad.
i agree, as i mentioned in a post on one of the other comments, i think the best way to make this happen would be through developing a subscription-based app of some sort and spend the "working time" maintaining/improving it.
