All of these sites are things I either use, like looking at, or respect greatly.

art

• ascii-paint: for creating ascii drawings
• a2b2: visual art posting with radio

music

• music-map: find related artists based on others interests

nekoweb

• nekoweb: the hosting platform that this site is on :)
  I’m fairly new to this community, but I think it’s really cool and you should check out all the different sites on it