The Primo Battery Cube from Phonesuit is a cube shaped rechargeable battery pack for Android and Blackberry SmartPhones. Actually, it should work with any mini or micro USB enabled device. It’s very compact at 1.5 inches in length and width, but provides 1000mAh battery capacity. It also features a 4 point red LED display that shows the remaining charge in 25% increments. It’s available now for $39.95, or grab 3 of them for $99.95.
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Points to Primo for design, but the Tekkeon TekCharge MP1800 is cheaper (via Amazon), has four times the juice and an integrated flashlight: http://www.tekkeon.com/products-tekcharge1800.html