digital art online

bitforms (new media gallery)
eai  (electronic arts intermix: an archive of video art, etc)
rhizome  (art that engages technology)
ubu  (all kinds of art and ideas)
Whitney Artport  (whitney museum's net art portal)
Media Art Net
9 Evenings: Theater and Technology  
Daniel Langlois Foundationhttp://www.fondation-langlois.org/html/e/
ADA (Archive of Digital Art)
Electronic Art in Public Spaces
ISEA
Ars Electronica
Ars Electronica archive of artworks
New Media Caucus
New Media Encyclopedia