I feel that this would be a good source of information for the new Squidbase, I only accidentally came across them:
List of Giant Squid Specimens and Sightings
List of Colossal Squid Specimens and Sightings
[If you scroll down, there are almost complete lists, some apparently from as early as 1545 for Architeuthis and 1925 for Mesonychoteuthis Hamiltoni]
I hope this information is credible!
Thank you Archi! I've put this article up to allow TONMO.com visitors know that to us, these Wiki pages are the definitive list of giant and colossal squid observed throughout history. I hope to work with the authors of this page to provide addition detail for individual accounts (we've been cited a few times as it is).
To discuss any of these events, TONMO.com is the right place:
Architeuthidae Forum -- for Giant Squid discussions
Cranchiidae Forum -- for Colossal Squid discussions
-- Tony Morelli (tonmo), Founder and Webmaster, TONMO.com