check out this guy. he charges a 1F supercap during the day, and outputs 2v regulated 10mA at night. i'll build some stuff to flash lights or something eventually. (better photo of components after the jump)

there he is...
closeup photo of small free-form circuit with a triangular array of three glass square solar panels. it is sitting atop a jar lid

there he goes...
same as above photo, though with the little device rotated so you can see the free-form circuitry built with the component leads shaped to build a circuit in free space