Nature field guides available for your iPod

The National Audubon Society has prepared and arranged Audubon Field Guides for downloading onto an iPod. Topics include birds (740 species and 2300 songs), wildflowers (1800 species), mammals (280 species), and trees (900 species). More topics are being planned such as insects and spiders, butterflies, reptiles and amphibians, fish, and seashells.