Science Magazine has the story of a potentially huge technological win, an "artificial leaf" made of cheap materials via MIT that uses ambient sunlight to catalyze the production of hydrogen and oxygen from water. If this works out, the "hydrogen economy" will suddenly be back on the table.
It won't solve all of our problems by any means, but if it's cheap enough it would pretty quickly resolve some of the biggest ones.
There are some other solutions out there that (as far as I know) remain in the plausible category. While it's crazy to depend on the technofix to our energy problems, it's equally crazy not to root for it.