Clothlike photovolatics. You'd be quite literally wearing a patch of solar cells on your jacket, powering your appliances. Self-charging power cells, when it runs low, it'll tell you through audibles or a simple electroluminescent indicator. Just set it outside and it'll happily charge itself.
New processes for PV's to be built. Self-charging billboards using LED's or other low voltage lighting, eliminating high powered spots that pollute the night sky. I don't know how they would stand up to the rigors of space travel, but I'll bet they'll come up with something, perhaps laminating BB PV's in Lexan or a similiar transparent material.
Maybe a paint using them, making once again, self powered equipment, or hybrid wind generators that keep generating power even when the wind is calm!
How are they at being a wearing face? New generations of bearing materials that have an even lower friction coefficient than the current materials.
Also, new formulations for fuel using polymer chains of BB's maybe in order, making it an excellent replacement for sulfur as a lubricating additive.