Cellulist ethanol has been produce from enzymes for a few years now. There is a Canadian firm in the running. My understanding is the process is lengthy and you need to do things like recycle the enzemes. It may not work out commercially.
http://www.iogen.ca/In addition fuel can be made from cellulose by burning it in the presence of water but with insufficient oxygen. It produces something called wood diesel, see Wikipedia. It's inefficiet, produces a litre of fuel from 10 pounds of cellulose - but it's low tech. This is how they produce diesel from coal as well, by incomplete compustion.
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