The following links are for the major Windpower Associations and governmental institutions

Windpower Associations:

North America
American Wind Energy Association
Canadian Wind Energy Association
National Wind Coordinating Committee
National Renewable Energy Laboratory
American Council on Renewable Energy (ACORE)
Database of State Incentives for Renewables & Efficiency (DSIRE)
North American Windpower
US Department of Energy – Wind Powering America
Utility Wind Integration Group (UWIG)
Midwest Renewable Energy Association
Illinois Renewable Energy Association

International
Global Wind Energy Council
The World Wind Energy Association
European Wind Energy Association
Austrian Wind Energy Association
British Wind Energy Association
Danish Wind Industry Association
The Windpower (turbine and windfarm database)