Extend your phone battery.
If you find that your battery for your iphone or blackberry is getting drained very quickly , you may want to purchase one of these inexpensive units. I know there are many different types of rechargeable units out there and I have not had the chance to test others. I'm biased because I've already been using the Richard Solo battery. I placed an order online for a group order which made it cheaper by 15%. Here's a video on the iphone battery. They also have a new model for Iphone 3G and Blackberry. Shipment was quick and hassle free.
Here's the link RICHARDSOLO