Open Sans in action on historicfutures.com

.header-1 { font-family: 'open sans', sans-serif; font-size: 51px; font-style: normal; font-weight: 800; letter-spacing: normal; line-height: 55.569007873535156px; text-transform: none; color: #333333; }
.header-2 { font-family: 'open sans', sans-serif; font-size: 16px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 17.600000381469727px; text-transform: none; color: #666666; }
.content-1 { font-family: 'open sans', sans-serif; font-size: 18px; font-style: normal; font-weight: normal; letter-spacing: normal; line-height: 25.200000762939453px; text-transform: none; color: #333333; }
Open Sans is available from Font Squirrel, Google Web Fonts, MyFonts and Typekit.
Found by @mikesten on 7 Feb 2014.

Liked by:
@mikesten @rey @highfivebids

Open Sans