Warren Moon did with the oilers in the late eightys early ninetys
Many player have wore the number but the most memorable person to wear this number is Peyton Manning. He is arguably one of the best quarterbacks in NFL history and after the departure in Indianapolis he kept number 18 as he ventured to Denver.
John Hadl (he later wore 5, I think)
Ronnie Lott wore # 42
Sean Taylor was a famous NFL player who wore Number 21 for the Washington Redskins. He was murdered when he was shot during a botched robbery/home invasion.
Mike Sellers From The Washington Redskins
L.C. Greenwood of the Steel Curtain
Nick Mangold, Center for NYJ
Jack Ham, Pittsburgh Steelers
Jamal Charles to name one
Cam Newton, Warren Moon
Ben Rotheinsburger and Michael Vick both currently wear the number 7. John Elway also wore the number 7. That's all I can think of right now :P