I'm a Utd fan, but I think it will be a more open title race this year. Although I'm very excited about watching the new players we have acquired, I think it will take time for them to adapt, and the team may struggle with consistency as a result. I also think keeping Saha fit will be very important, with the lack of other out and out strikers at the club.
I think Liverpool will have a much greater chance this year, Torres is a huge signing for them, and their other new players look to have settled in well already. Arsenal will do a lot better I'm sure, I think there is less pressure/expectation on them now, what with Henry gone.
Though I still think any team that finishes above Chelsea will win the league, they will be desperate to get the title back.