Here is some rather crappy footage of the classic video game day that I organized for the local public library. (It's hard to run something like this and get decent footage at the same time.)
In any case there is a lot of Dreamcast (and Saturn) action in it. During the Tournament I even used the Dreamcast Atari collection.
The most popular Dreamcast titles were Marvel Vs Capcom 1 and 2. I had seven different stations set up with classic video game systems including an Atati 2600, NES, N64, Genesis, PS1, Saturn, 2 Dreamcasts, and a couple of PCs with Starcraft and Doom multiplayer set up on them.
The Dreamcast systems were by far the most popular with the general public.