Abe Connally wrote:currently working on my gasifier system, and I can tell you it is NOT easier than solar panels. Cheaper? maybe, if you don't count time collecting fuel.
For cooking, solar is definitely cheaper than biogas, electricity, gasiefier, etc. Seriously, you can build a solar cooker for about $3: http://solarcooking.org/plans/windshield-cooker.htm
Biogas is easy, as long as you have very local access to tons of feedstock. If not, you're really looking at cooking, lanterns, possibly space heating (forget transportation).
Wind energy can be cheap if you build the units yourself. I've made about 200 wind turbines for under $50 each : http://www.velacreations.com/chispito.html
Gasifier is really the only practical thing for transportation energy (besides bikes). Still, you're looking at $500 min for a junk-yard unit for your car.