Where's the love for Peaches? He was great before that scary injury. Now that he's had plenty of time to recover why not bring him back? He's a great guy to have in the locker room. Anyone who thinks he's unintelligent needs to look past the goofy antics and see that he is a great veteran leader. AND he is big enough to guard big 2s like Joe Johnson. Don't dismiss him because of his poor play after that injury- he was clearly a totally different player before vs after. I see no reason why that injury should continue to limit his play after such a long time to recover.
Obviously, I'd prefer Courtney Lee, Mayo, or someone else of that ilk, but MP will come cheap for what he is- a decent spot up shooter and above average wing defender who can provide bursts of energy off the bench and occasionally be called upon to play a slightly larger role (like he did when Bradley/Ray went down last year).
I think there is plenty of love for Pietrus, but he wants more money than we can actually give. If we had his rights, he'd probably be signed by now. If Pietrus wants to come back to the Celtics, he's gonna have to do it at the vet minimum.
Ainge is gonna try pretty hard to get Lee or Mayo, I don't know if either is really going to happen, but I wouldn't put anything past Ainge.
If he can't get either, and Pietrus doesn't want to accept the vet min, look for a McGrady, or Grant Hill like signing. McGrady would start at SG till Bradley gets back, if it's Hill, Pierce would start at SG for a few months and Hill would be your SF.