A company called zoomMediaPlus has created the Zoomit, a SD card reader for iPhone and iPod touch.The Zoomit is compatible with all iPhone and iPod touch generations and connects to the dock connector. With the Zoomit iPhone app, users can view the content of the SD card and even transfer the content to iPod touch/iPhone.
The ZoomIt SD reader will be shipped in April 2010. It costs $59.95. More details.