I've been lurking here for some time now. Thought'd be time to share our experience of the last two years of building and owning a skoolie. You can check out my wife's blog at http://errabundusbus.blogspot.com/
There is a lot of non-skoolie info there also, so if you just want to see entries about the conversion, there is a way to do that on the right hand side of the blog.
We are a homeschooling family of 7 who love to camp. Our skoolie is setup more for weekend getaways and family vacations rather than permanent dwelling. The thought of living off the grid and being self sustainable is very appealing however.
My latest project for the bus is a homemade hydronic heating system for the bus. So far all I have is a 40 gallon gas water heater cut down to about 5 gallons and a head full of ideas. I am planning on mounting the water heater under the chassis and running hot water lines to baseboard heaters. At this point it'll run off of propane or an electrical element if we have shore power.