FF DIN with Helvetica in action on photojojo.com

Under the hood

.header-1 { font-family: ff-din-web, Helvetica, Verdana, sans-serif; font-size: 54px; font-style: normal; font-weight: 100; letter-spacing: normal; line-height: 81px; text-transform: none; color: #6A6A6A; }
.content-1 { font-family: helvetica, verdana, sans-serif; font-size: 25px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 37px; text-transform: none; color: #6A6A6A; }
.content-2 { font-family: helvetica, verdana, sans-serif; font-size: 25px; font-style: normal; font-weight: 300; letter-spacing: normal; line-height: 37px; text-transform: none; color: #6A6A6A; }

FF DIN is available from Fonts.com and MyFonts.