I thought SD was for SunDay. SunDay is Savings Day with SD98... But as Danielle said, it does not stand for SD and anyone can participate!
More and more of the participants are not SD members.
It seems like the more participants we have, the better we do. I'd love to see people combine forces and use SD98, as a group of sellers. If people want to start an Auctiva95 or whatever, that's fine, but much of the hard work has already been done with SD98 and everyone here is welcome to participate!