Introduction to the South African Seashore- Although this series of clickable pages which contain photographs and text may be extremely slow to load in slower modems, the photographs showing the zonation in the intertidal is very instructive.
Rocky Intertidal- Excellent color, high-resolution photographs and descriptions of rocky intertidal habitats, and inhabitants.
Rocky Intertidal- A very well composed resource for more information on life in the rocky intertidal. Particular emphasis on human intervention in this ecosystem. From the Monterey Bay National Marine Sanctuary.