When all you need to know is the wind forecast, current conditions or want to see some logs, check these sites. Tell us where you find the best wind info.
For Free: WindCast Graphic representation from Intellicast
Wind Map Graphic representation from Underground Weather
Cape Cod Wind Page Just shows Cape Cod, but it's terrificfree compilation of data
For a Fee:
Windsight.com Detailed Wind info from the Canadian border to San Francisco Bay for a fee.
Windhotline.com When you have to know accurately all the time, pay to get the info.