First off I would like to say,as an operator of the largest solar arrays ever flown in space, that as a primary source of power, solar power completely sucks.
However as a supplemental source of power it would be awesome to have the panels integrated into all new homes. If you picked up a plugin-able hybrid you could charge the car from the solar panels during the day further reducing your gas usage.
I'd also like to see someone produce an emergency power source using collapsible solar panels, wind turbines, and batteries which could be used by hospitals, police and fire stations during disasters like Katrina. After the disaster setup the panels and turbines on the roof (they make collapsible 400 watt wind turbines) connect em to the batteries and have a KW or 2 to power radios, satellite phones, refrigerators for medicine, etc.