My wife and I are currently doing something similar. Traveling the world (4 continents, 20+ countries). She's working on photography and blogging while I'm developing my own iphone apps. Best decision we've ever made, and haven't looked back since (been on the road for 3 months, currently at an airbnb in Taiwan). My wife keeps a blog at http://www.shenventure.com if you're interested in reading about how we did it.