Smith made 93 appearances for Man Utd, scoring 12 goals and will join his former Elland Road team-mates Mark Viduka and James Milner (pictured).
It has been a deal that has run its course, but one we (NewcastleUtd-Mad) never gave up on, insisting Big Sam would get his man.
The player told Manchester United boss he wanted to fight for his place, but Sir Alex Feguson had his mind made up that he needed the money and the deal was sorted today.
The 26-year-old has moved on to Tyneside for an undisclosed fee (believed to be around £6million) on a five-year contract.