Earth2tech believes that 2007 has been a good year for solar stocks:

The biggest gainer is Littleton, Colo.-based Ascent Solar Technologies (ASTI), a maker of thin-film modules. Ascent’s stock has risen nearly 500% through September. Following it is Hoku Scientific (HOKU), Trina Solar (TSL), SunPower (SPWR), First Solar (FSLR) and JA Solar (JASO).

Company valuations have increased but that has yet to be matched by revenues and profits.