The new Powcell charger for the Apple iPhone is making users leap with eco-friendly excitement. This new solar powered slip-on charger has just been introduced as a more green way to charge your beloved iPhone.  The device's design allows your phone to be continuously charged and reduce the chance of missing that important call due to a low battery. The Powcell will be available for the iPhone 3G and 3GS.  No word as of yet on cost,...