These are books that I have read or use often as a reference that I would recommend as part of anyone's library. Buying them through the links provided helps in a little way with the photographic equipment I'm needing.

Photography

The Adobe Photoshop CS3 Book for Digital Photographers (Voices That Matter)

Adobe Photoshop Lightroom Book for Digital Photographers,The (Voices That Matter)

Adobe Photoshop CS3 for Photographers: A Professional Image Editor's Guide to the Creative use of Photoshop for the Macintosh and PC

John Shaw's Landscape Photography

John Shaw's Nature Photography Field Guide

Presentations & Related

Presentation Zen: Simple Ideas on Presentation Design and Delivery (Voices That Matter)

Envisioning Information