Giggs somehow managed to pick out Cech with the goal at his mercy as he slid on to a Rooney cross and then Drogba headed into the side-netting from an equally promising position.
Friedel made amends for his error as he tipped over a chip from Deco and then denied Drogba at point-blank range, then seven minutes into the second half Dunne's fellow center-back James Collins put Villa ahead from another Young corner as he was left unmarked at the far post.
He was angry after Chelsea came back late for the second half and then felt Drogba tried to get Greening red-carded.
Didier Drogba then had a header ruled out for offside, the Chelsea striker wagged his finger in protest but replays proved referee Alberto Undiano Mallenco was correct.
Drogba then gave Chelsea hope, if only for a matter of seconds, when he took Michael Essien's pass on his chest and drilled a low finish beyond Van der Sar.
"Clearly, Darren Fletcher's won the ball, Ashley Cole's never touched and has jumped up in the air, and then (Didier) Drogba's pulled Brown to the ground for the goal, " Ferguson told reporters.
But he was left to rue the fragility of the defence in front of him when Jon Mikel Obi's long ball was chested down by Drogba, who then held off Finnan and fired in at the near post.
In 2005, Swedish referee Anders Frisk was heavily criticised by then Chelsea boss Jose Mourinho after Drogba was controversially sent off in the first leg of a last-16 Champions League tie against Barcelona, which the Spanish side won 2-1.
Then a disastrous back-pass from Christopher Samba presented Drogba with a gilt-edged chance but the Ivorian's shot was saved by Robinson with his legs.
Foster also denied Drogba from a deflected free-kick and then last season's Premier League top scorer saw his sensational header crash back off the corner of post and bar and to safety.
Heskey won the free-kick, tempting Khalid Boulahrouz into a rash challenge, and the former Liverpool striker then got to Josip Skoko's set-piece delivery before Drogba.
Kalou then got on the end of a rapier-like Chelsea counter-attack inspired by Didier Drogba and Robben.
Eboue then burst through down the right only to fire across goal and Siaka Tiene blasted over from a tight angle following Drogba's cross from the right.
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