SunPower continues to fall...

Shares of SunPower (SPWRA) fall another 7.4% and hit a 52-week low.  The firm appears a leader in the emerging market for high-efficiency cells (I, II), but Morningstar has doubts: "In our view, SunPower uses solar technology that is likely to remain too costly compared to its peers. As a result, we expect the mediocre results of the last couple of years to continue for the foreseeable future."