The U.S. Department of Energy has a nice web site for their Wind and Hydropower program. I found a subsection of the site called "Wind Powering America" that contained a lot of valuable information on wind power. I clicked through to an update presentation they had available and wow - this report is amazingly thorough and has some really nice maps, research, correlative data and is a really nice place for anyone looking to learn about wind power and all of the environmental and economic benefits to start.
The 20% Wind-Electricity vision states:
Wind energy will provide 20% of U.S. electricity needs by 2030, securing America’s leadership in reliable, clean energy technology. As an inexhaustible and affordable domestic resource, wind strengthens our energy security, improves the quality of the air we breathe, slows climate change, and revitalizes rural communities.
Check out the Wind Powering America Update presentation here