There was a very good japanese video on youtube about the Dreamcast. It was recorded one month before the japanese release and in the video, Yuji Naka showed the travel that Sonic Team did to a country where they got the inspiration for one of the stages for SAdventure. Funny thing is that, you can see young Takashi Iizuka saying "I am Takashi Iizuka and i want to put more romance in Sonic series" lol.
Unfortanely, the video is not there anymore.
So i will share this video showing a japanese tournament of Fighting Vipers. Very good video, you can see a lot of funny things and also legendary players BunBunMaru and Ikebukuro Sarah.
[youtube]http://www.youtube.com/watch?v=HbOG5ljEEMM[/youtube]