Atech Flash Technology’s iDuo2Go ($25) falls squarely in the “two birds with one stone” category. It combines two separate accessories into one, eliminating the need to carry extra peripherals around. A USB 3.0 SD Card reader is melded together with a classic 30-pin Dock Connector, giving Mac users the ability to transfer SD card photos to their computers, or sync older iPods, iPhones, and iPads—but not to use the card reader…