If you want to backup your iPhone and iPod data to SD card then iOmega has a product for you. Iomega SuperHero is a dock for iPhone and iPod that can back up photos and contacts to SD card.
You can back up multiple phones that includes iPhone 3GS, 3g, iPhone 4 and third fourth generation iPod Touches. Costing only $70 you will get a 4GB SD card along with the package.
Note: Apps and music is not yet supported due to Apple’s restrictions.