Articles of all kinds that will reveal some nice information to you. And some additional Stories from the Past.

Articles

Prehistoric Debate (by Klaimen)
Growing up with Ecco the Dolphin (by Klaimen)
Games for Ecco Fans (by Klaimen and others!)
E3 Demo (1999) of Ecco: Defender of the Future (by Klaimen)

Interviews

Defender of the Future

Interview with Maurice Molyneaux
Interview with David Brin
Interview with Peter Ligeti

Other

SEGA Fans Chronicles - Chapter XII: Hauke by RadioSEGA (external)
-> Special Thanks to David "KC" Luis at RadioSEGA for this great interview about CoH and Hauke's past experience with SEGA and Ecco!