SD board has officially opened 14.02.2008. Considered that, it's growing relatively fast.
It's a forum-based filesharing community, which offers direct links to mainly house, trance, techno, chillout, Drum'n'Bass and Electronic tracks. (Not to mix up with the tracker SoundDamage.com)
The site is not limited to filesharing only though, there are discussion sections aswell. Sign-ups are currently open, however planned to switch to invite only.