Robson had been determined to land a big name striker to lift spirits at Bramall Lane following relegation from the Premiership and got his man on a four-year contract.
Blades bound: James Beattie is waving goodbye to Everton
Sportsmail revealed last week that Robson had targeted the former England striker but Beattie was reluctant to leave Everton - particularly to drop down to the Championship.
Blackburn had expressed interest and Middlesbrough and Birmingham were also monitoring the race but United made the best offer and Robson's persuasive talking did the rest.
The manager said: "I'm delighted. We've got a strike force now that ranks as the best in the Championship.
It's a signal of our intention to return to the top flight."
Robson has signed winger David Carney from Sydney FC but has failed to land Wigan midfielder Kevin Kilbane.
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Duchess of Cambridge is pretty in pink at her first Buckingham Palace garden party
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News pictures of the day
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The Glamour Awards - stars turn on the style
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Horror on the 5.53! Commuter dragged 200 feet after getting hand trapped on train
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Chelsea have the League’s highest wage bill for eighth year in a row
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Locked up and banned: The Tube drunk whose vile racist rant was caught on film (video)
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British housewife facing FIRING SQUAD over Bali drugs smuggling charge was 'neighbour from hell' -
London 2012 Olympics: Raising the bar and the Games haven't even started yet. Price of toasting Team GB is £6 a pint! -
Timebomb ticking in Thames Estuary could put Boris Island plans in jeopardy -
Video: Intruder bursts into Leveson Inquiry to brand Tony Blair a war criminal
Family pay tribute to the London man who gave his life to save a five-year-old girl from drowning 
Eton schoolboys fly Games flag on Everest 
Shrimpy's - review 
London Fields forever: street style from the hippest park 
The O2
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Celebrate with MARTINI®
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Victoria Coren
Summer party
Diamond Jubilee
Glamour Awards
Garden party
First review
Fair-weather goths
Dog save the Queen
A better ex than husband
Best of the Baftas
