Bitter, Open Sans with Source Sans Pro in action on tenbourne.com

.header-1 { font-family: Bitter-Italic, Times, serif; font-size: 14px; font-style: normal; font-weight: normal; letter-spacing: 1px; line-height: 28px; text-transform: uppercase; color: #CF1332; }
.header-2 { font-family: SourceSansPro-Black, Helvetica, Arial; font-size: 70px; font-style: normal; font-weight: normal; letter-spacing: 2px; line-height: 80px; text-transform: none; color: #3A4046; }
.content-1 { font-family: OpenSans, Helvetica, Arial; font-size: 18px; font-style: normal; font-weight: normal; letter-spacing: 1px; line-height: 32px; text-transform: none; color: #5D656C; }
Bitter is available from Font Squirrel, Google Web Fonts and Typekit.

Open Sans is available from Font Squirrel, Google Web Fonts, MyFonts and Typekit.

Source Sans Pro is available from Font Squirrel, Google Web Fonts and Typekit.

Try this combination out in Pair and Compare.
Found by @mikesten on 28 Oct 2013.

Liked by:
@franck_koty @davidecorizzowp @opposablethumb_ @JulesBurnz @mikesten @my_chiguai @vasil_d @_hnk_w_ca @brisayswhaat @both_birds @itswaveney @Davistbro @blankchildrens @ughnett @seahcb @Fafnirical @JTumain @davidpozo_ @janslyn @WBartholomees @bennymountains @shavonneyu @GR36 @gfbiv @brandonwalowitz @Nick_gudkov @gmogilewski @oh_sk @DerienBrown @zemsgraff @BKRebeless @drewnaylor @israelobiagba @jfcomartinez18 @Jimmy_Franko @johnstuif @bvdew

Bitter, Open Sans with Source Sans Pro