It's funny to think that Derby no longer feature in these discussions - they spunked a fortune on players last summer.
As for promotion, it's looking like 89 or 90 might be required with three of the top four bang in form this close to the end of the season, and the fourth team having two games in hand.
I think the only team nailed on for a play off place is Derby, with Sheffield Wednesday, Birmingham and Ipswich probably fighting for the last one. Then again, Preston might have something to say about that...