Click through our gallery to see if you can remember some real highs and lows for the Blades.
5. Blades photos from the noughties
Laurent D'Jaffo scores from the spot against Wolverhampton Wanderers in August 2001. Photo: Laurence Griffiths
6. Blades photos from the noughties
Michael Brown celebrates after scoring his second goal against Norwich City at Carrow Road in September 2002. Photo: Mike Finn-Kelcey
7. Blades photos from the noughties
Jubilant United fans invade the pitch after the Worthington Cup third round tie with Leeds at the Lane in November 2002. Photo: Laurence Griffiths
8. Blades photos from the noughties
Wayne Allison celebrates with Michael Tonge after scoring the second goal in a 2-0 win over Sunderland in the Worthington Cup fourth round at Bramall Lane in December 2002. Photo: Laurence Griffiths