Here you'll find backups of various Dreamcast websites.
Full backup of the original ChuChu Rocket! website (chuchu.web.dreamcast.com).
Ecco the Dolphin: Defender of the Future
Full backup of the Ecco the Dolphin: Defender of the Future website (eccothedolphin.com).
Full backup of the original Sonic Adventure website (sonic.games.dreamcast.com). "Original" is the original the website with some bug fixes and modified to work with MySQL database. "Custom" is a modified version of the website which can be used with alternate credentials (such as a forum login) instead of the original Dreamkey ones.