A video introducing belemnites [see also here] which were extinct cousins of the squid, octopus, and cuttlefish; see also here.
The giant squid, Architeuthis dux, evaded being photographed alive for the whole of the 20th century. Finally in January 2002 one was caught by chance off Japan and photographed; since then there have been half a dozen giant squid caught alive and photographed.
Here is a slideshow of all known living Architeuthis photographs.
A video slideshow of the best images of the most recent captures of the Antarctic cranch squid Mesonychoteuthis hamiltoni, a.k.a. the ‘Colossal Squid‘.
No-one truly knows how large this grows, the largest male caught measured 10m in length, but it’s thought the females grow even larger…
Squid and sperm whale: here.
Cuttlefish camouflage: a quantitative study of patterning: here.
Belemnoteuthis antiquus is technically not a squid, but a belemnite: here.
Dear Kitty. Some blog 
Inky Humboldt Squid make unpredictable appearance
The Associated Press
Article Last Updated: 06/03/2007 04:03:20 AM PDT
NEWPORT BEACH, Calif.- The inky and unpredictable Humboldt Squid is back in big numbers in the coastal waters of Orange County.
The sizable cephalopods, which can weigh 30 pounds or more, appear and disappear off the coast with no predictable pattern.
They last showed up in significant numbers 2 1/2 years ago, when they swarmed up and down the California coast by the thousands, with hundreds washing up on beaches.
“We used to associate them with warm water,” said Norris Tapp of Davey’s Locker Sportfishing. “But now we’re seeing them when the ocean is cold.”
Many sport fishermen love struggling against the squirting, squirming beasts.
“It’s out of control. They’re squirting ink and water when they’re brought aboard, and they’re flashing their colors,” said Chris Fowler, who works with Tapp.
Tapp said the fish are a handful when hooked, but it’s not hard finding bait to make them bite.
“They’ll eat about anything—other squid, sardines, even sculpin,” he said. “Open up one of these squid, and you’ll find lots of fish eyes. It’s weird.”
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