Cameras / Digital Backs for Tethering

Nikon
Canon
PhaseOne
Leaf
Mamiya
Hasselblad

Tethering Software

Capture One
Apple Aperture
Adobe Lightroom
Nikon Camera Control Pro
Canon EOS Capture
Bibble
Mountainstorm
Jibble

Photography Communities / Blogs / Resources

TetherTalk
Photocamel
dpreview
Luminous Landscape
Photofocus
Digital Photography School
American Society of Media Photographers
Professional Photographers of America
PDN Gear Guide