YouGov, which acquired a U.S. company founded by Stanford Professor Douglas Rivers, Polimetrix, is a high-quality, respected online survey sample provider.
Although their method for ensuring a representative, generalizable sample is different than what is used in traditional telephone surveys, it is grounded in solid statistical theory and has consistentlyproven itself in the field. (Read more orcontact us for additional information.)
To the side is the 2010 pollster ranking from Nate Silver of the polling analysis blog, FiveThirtyEight, now a part of NYT online. Silver ranks YouGov third in accuracy for state polling in 2010. You can find the post with this chart here.