At last, Nokia coming in competition with other operators has announced a USB Charger that can be connected to any PC, Laptop etc,via a USB port.

This USB charger works on all Nokia phones as unlike other companies, Nokia has a similar charging point on all its phones.

 The world is finally changing. After most phones (like most Windows mobile handsets and recent ones from Motorola and LG) have started offering standard USB chargers and China trying to make it compulsory to include USB ports in all phones, Nokia seems to have realized this and is offering a truce: a charger that plugs into the USB slot on any PC, laptop or Mac, and recharges from there. There are two models available, a 2mm one (CA-100) and a 3.5mm one (CA-70). No word on the price or availability, however has been declared yet.

 There are lots of such third-party cables available out there, but this one is the official one. Some also suggest you to make your own!
Nokia has already included a miniUSB port in phones like the 5300 XpressMusic edition.