802.11 Wi-Fi:
IEEE 802.11 standards committee http://grouper.ieee.org/groups/802/11/

802.16 WirelessMAN
IEEE 802.16 standards committee http://grouper.ieee.org/groups/802/16/

802.16 WiMAX
WiMAX Forum
http://www.wimaxforum.org/tech

802.20 Mobile Broadband Wireless Access
IEEE 802.20 standards committee http://grouper.ieee.org/groups/802/20/

Cable Modem
CableLabs
http://www.cablelabs.com

DSL
DSL Forum:
http://www.dslforum.org