Just look at earnings estimates going forward --- practically the same numbers per share, and only slight differences in growth (maybe warranting at most a 25% premium, not 250% premium) and look at this huge discrepancy. Is this a pairs trade (long SPWR short FSLR) you'd take?
OK I'm doing more research and it appears SPWR is forecasting 1.27 for 08. yahoo numbers are wrong at 2.00. Now the question remains about FSLR #s.