According to ESPN, Matt Barnes has opted out of his contract with the Magic, making him a free agent. Supposedly he wants to return to the Magic with a new contract, but I'm sure he'll weigh his options.
Would you like him on the Celtics? I would. He's 30 but I still think he has a couple good years left, and he would give us exactly what we're missing off the bench: a real SF who can hit perimeter shots and defend for 20 minutes or so a night. He also has that dirtiness / toughness / trash-talking nature that would allow him to fit in nicely around here.
Platoon him with TA and we wouldn't need a backup PG. I think Barnes would work well with TA - in the way that Marquis / Finley didn't. We wouldn't have to use the whole MLE on him, either.
This assumes we don't use #19 on a wing, in which case I think we should just play the youngster.