Image via: Guiding Light Mailbox
Upon first thought, this seems like a silly invention. Who needs a solar-powered mailbox anyways? Then again, if you've ever been lost in the dark looking for a house in the middle of nowhere, you might appreciate an illuminated number that you can see "from half a football field away."
Worried that the solar panel might not work in cloudy weather? No problem - 4 hours of charging will keep that number lit for 4 days continuously (and did we mention that you can see it from half a football field away?). So, maybe it won't work in areas in the extreme north where you have darkness for weeks on end, but most other locales should suffice.
You can find the Guiding Light mailbox light online starting October 1 and they retail for $79.99, which includes shipping and handling. :Guiding Light Mailbox (Note: Website will not be available until September 28, 2009).