The first site, and probably my favorite, is http://www.goodmusicallday.com/. This site is easy to navigate, has a wide variety of genres, and is completely free. Most of the artists featured are up and coming, the site also features many mash ups and remixes. They also have a wide variety of chill, laid back music. For sure a must see site.

Goodmusicallday 2.0 Promo