Solar panels and wind farms?

I was sitting in APes today and we just began studying alternative fuel sources. We were going through some of the pros and cons of each and when we came to wind power the only real drawback was that it takes alot of land. I w wondering if they could combine solar power and wind power in the same area. For example, we usually put wind farms in arid areas where nothing is around. Now wouldnt that be a perfect place for solar panelss since there is nothing blocking the sunlight in the arid areas. Could they put solar panels on the wind turbines or combine a solar power tower to the wind turbines. FYI, the power tower is when you have a bunch of mirrors reflect to a high tower. Any thoughts?