Now you can charge your iPhones using wind chargers. The iFan basically is a modified PC fan erected into a rubber-made iPhones case. According to iFan designer, Tjeerd Veenhoven, it took him six hours to recharge his iPhone using iFan.
He also said that in near future he will redesign iFan blades to improve the charging speed. Its cool and eco-friendly. I think all cell chargers should like this.