For the frugal traveller who wants to live in a van but move around (perhaps while developing your web app or similar), we've started a community where fellow RV'ers (or people who just like RVers) offer their driveways to others to camp on for a night or two for free - http://www.boondockerswelcome.com. We're going to start charging a small annual fee to cover our costs, but for $25/year you can travel all over the continent and park your van for free. Of course, this doesn't solve the bathroom or showering issue, as most people aren't opening up their bathrooms to their guests. But my mom (who has a small Roadtrek RV, which is really no bigger than a van and has no shower), has travelled for 5 months at a time getting by with showers in the occasional truck stop or an outdoor shower that she uses when they're parked in the forest. (There's also tons of free parking for RVs in US National forests BTW, plus lots of other spots. My mom writes e-books all about the free "boondocking" locations she's discovered complete with GPS co-ordinates and interesting nearby attractions - find them at http://www.frugal-rv-travel.com.)

I know that this comment reads like a big advert, but if hackers here are actually interested in living on the cheap while launching their bootstrapped startup, these are actually viable options.