The Boston Celtics have been one of the NBA's busiest and successful teams this offseason, in re-signing their own players (Kevin Garnett, Brandon Bass, Jeff Green and Chris Wilcox), Good draft picks (Jared Sullinger, Fab Melo and Kris Joseph), and making moves to acquire new ones (Jason Terry, Courtney Lee and Jason Collins).

Despite all their sign and trade activity so far, the Celtics continue to make moves that will help them make a run at their 18th championship.

The Boston Celtics have reportedly reached a contract agreement with free-agent guard Dionte Christmas, who has impressed on both ends of the floor during the last two weeks of summer league play.

Christmas announced the news on Twitter after the team's final summer league game Sunday, and The Boston Herald reported that the deal contained a partial guarantee.

Known primarily as a shooter and scorer during four years at Temple, Christmas revealed aspects of his game during the NBA summer league that he developed during his time overseas. He rebounded well for a shooting guard (6.2 per game in the Orlando Summer League, 4.4 in Las Vegas), showed an improved ability to create shots for himself and others, defended the opponent's best wing every game and even demonstrated point guard skills when forced into ball-handling action.

There's still a chance that Christmas fails to survive Celtics training camp. But with E'Twaun Moore traded away and three roster spots for grabs, Christmas is likely to make the opening day roster.

Additionally, The Boston Globe reported that the Celtics signed former Atlanta Hawks center, Jason Collins, and guard Jamar Smith, who played with the NBADL's Maine Red Claws last season -- both will be on the team's training camp roster, according to the report.

Celtics now have one of the deepest benches in the NBA with their new acquisitions.  The only thing that seems to be missing from the Boston Celtics is another Point Guard to back up Rajon Rondo.

My money is on the C's bringing Dooling back for another year. He provided the Celtics with a great locker room presence in 2012, and he also seemed to be a great influence on Rajon Rondo. Not only that, but he came up pretty big during the team's playoff run.

A sign that Boston fully intends on bringing Dooling back? The team told first-round draft pick Fab Melo that the No. 51 (the number Dooling wore this past year) was not available. I think Ainge was just trying to get a lot of other things done first. I am pretty sure that we will see Dooling in green once again come the fall.