Hacking Your Way Around The World?

TheTraveller asks: "I'm a European system/software engineer, with 25 springs behind me. Recently, I've got a bit fed up with staying tens of hours in a row in front of a screen, so I've decided to quit my job and tour this small planet. I'll obviously have to work to live, and I'll probably pick fruit as well; but I can't deny being a nerd. Have any of you Slashdotters had any experience on traveling the world and hack to survive? Are there companies willing to hire you for just one or two months? Can you be a part-time hacker? Any juicy info or link welcome." Sounds like a cool idea, but what are the realities for technical companies (on a nation-by-nation basis) hiring temporary workers like this on short notice?