I wish I'd gotten a Dreamcast. Looked like there were some top notch games on there (and I always wanted to play the original Jet Set Radio).
I never had a Dreamcast, but i know plenty of people with one. The Dreamcast was an amazing system that got pushed out of the way with the arrival of the PS2. It had amazing graphics for its time, original and fun games. It had a sense of "strange-ness" that had never been seen before and still has not been seen. The Wii will be the same as the Dreamcast in the sense that it is going outside "the box", but it will suceed where the Dreamcast failed.