I'll go with what neville said in the after match comments, this was the final twist and the knockout blow.
City will find a way to win at newcastle and do the job against qpr. I'm suprised by how many think city will drop points at newcastle, they have a tough game against chelsea tomorrow and after the wigan result i'd imagine they'd be going in down on confidence after 2 losses on the bounce, city have enough class in their team to get the result as long as they turn up.
United were 8 points clear a few weeks ago, I can't remember a team losing the title from that position at this stage of the season, United over the years have nearly always been solid in the run in.
Mancini appears to have really got the better of fergie in recent weeks.