Fresh from the clogged tubes of teh intarwubs…
"Where does all this leave string theory and the search for a theory of everything? Clifford Johnson, a string theorist at the University of Southern California in Los Angeles, thinks that the subject could mature simply by broadening its horizons. Honing its mathematical tools on condensed matter, where results from the lab provide stringent tests of any predictions it might come up with, will furnish string theory with a more powerful arsenal for attacking areas where verification comes less easily.
Others suggest the lesson is that string theory should lower its sights, and concentrate less on lofty claims that it harbours a theory of everything and more on where it can actually produce results."