Photographers

Photo74.com: This is a site with very smart design and excellent photography.
Cambridge in colour: Probably my preferred photography site it is full of wonderful and unexpected pictures and has a rich, clear and useful tutorial section.
Daniella's PBase gallery: You cannot find a bird book with such a wondeful images, I hope that soon or later she will publish one.
Todd Laffler Photography:Very good photography, I like a lot his kids candid.

Giga pixels photography

Gigapxl project: A really ambitious project, an almost complete collection of American images, at some gigapixels of resolution. They designed and produced a gigapixel camera and they managed to carry it along all the US. They have a lot of details about the process of creating such a monster, very interesting.
Max Lyons Digital Image gallery: Gixapixels images by stitching. This a very good place to look for software and photographic tips, especially if you are interested in stitching.