New solar power technology reduces size of panels
SolFocus, a company in Palo Alto trying to improve solar power technology, has announced that they have some new solar panel designs that magnify the solar light before it hits the photovoltaic panels, thereby increasing output compared to size. Unfortunately, they will be marketing them to industry and commercial enterprises at first.
I think the biggest stumbling block to solar power getting widespread acceptance among home owners is the cost. If you can reduce the size of the panels, and thereby reduce the cost, they would catch on more and become more popular.