The thing I hate the most about camping is running out of juice for my battery operated stuff. Here is a clever solution to this problem. Woods Solar Powered EZ-Tent comes with a set of solar panels that can be used to charge batteries or run LED light ropes that are integrated into the tent. There is also a central light that can be used as a flashlight or just keep it as a center light. For 2-4 hours of light, you will need to charge the tent for about 4-6 hours in direct sunlight. Another really great feature is that you can set the lights to come on once the sun sets. The tent comes in a 4-person and a 6-person version and will run $180 and $230 respectively.
[Product Page] [TreeHugger]