Chelsea are top of the pile once again after beating form team Birmingham 3-0 at Stamford Bridge. Frank Lampard struck a brace, one in each half, as Birmingham City's 16 game unbeaten run finally came to an end.
The host's continued to dominate and were rewarded just after the half hour with a long range Lampard strike, who then added a third in the final minute.
The Black Cats have now recorded just one win in 13 league matches.
The Gunners twice hit the woodwork - Cesc Fabregas struck the post in first-half stoppage time and then Tomas Rosicky crashed a shot against the underside of the bar after the break.
Arsenal now drop down to third whilst Villa remain in seventh.
Blackburn continue to pull away from the wrong end of the table with three points in a 2-1 home win over fellow strugglers Wigan.
Gary Caldwell scored his first goal for the Latics, levelling after the break. Morten Gamst Pedersen took advantage of a mistake from on-loan goalkeeper Vladimir Stojkovic in the 20th minute to put Rovers ahead.
However, Nikola Kalinic claimed the winner with 15 minutes to go, heading in a Pedersen corner, again the visitor's keeper was at fault.