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Portable phone charger information for iPhone4

How to determine negative and positive power source on phone charger by color code between red or white ?
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iPhone dock connector problems, with and without accessories

I started to experience problems with my iPhone that seem to be related to the dock connector. Upon plugging my iPhone into my (officially supported) car stereo, I started to get the message "This ...
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Credit card readers for iPhone - Can I use it as another input device?

I need a credit card reader for an app I'm developing. Since this site is more about the hardware than the developer side, I'm looking for a hardware piece that I can buy that reads credit cards. Most ...