Other
Octopus of California
Twenty great pictures of octopi from California. This site also offers up close pictures of invertebrates, squids, and tidepools.
Other
The Cephalopod Page: What Behavior Can We Expect of Octopuses?
The navigation and spatial skills, tool use, play, and personalities of octopuses are covered in the studies discussed in this article.
Australian Broadcasting Corporation
Australian Broadcasting Corporation: News in Science: Monsters of the Deep
This site from the Australian Broadcasting Corporation explains the uses and effects of an octopus's poison. The information that is presented is somewhat brief, but factual, and worth checking out on the subject.