Bob Mackenzie's twitter says there are 2 trades.

Boston gets Tomas Kaberle

Toronto gets Joe Colborne, Boston's 1st round pick in 2011, and a conditional draft pick in 2011 or 2012 (It will be Boston's 2011 2nd round pick if the Bruins make the Cup finals or resign Kaberle before the draft, it will be a 2012 2nd round pick if the Bruins re-sign Kaberle after the draft, or it will be Boston's 3rd roud pick if Boston isn't in the cup finals, and Kaberle isn't re-signed.)

Then there is a second trade to Atlanta.

Boston gets Rich Peverly and Boris Valabik

Atlanta gets Mark Stuart and Blake Wheeler

Valabik is a big defensive d man, will probably make his residence in providence.

Peverly has 14-20-34 totals on the season. He has a cap hit of $1.3 million, through next year.
Wheeler has 11-16-27 totals. A cap hit of $2.2 million, and will be an RFA after this year.

I am not sure what the Bruins are going to do space wise. It seems like there are too many guys for not enough spots.

Along the back line, the first 2 Defensive pairs are set -

1st - Chara - Kaberle

2nd - Kampfer - Seidenberg

For the third defensive pair, it will be a combination of Ference, Boychuk and Mcquaid.

On the offensive end, there is a logjam on the third line. The 1st and 2nd lines are pretty much set.

1st - Lucic - Krejci - Horton

2nd - Marchand - Recchi - Wheeler

However, there are 5 guys vying for 4 spots on the 3rd and 4th line. You have Seguin, Peverly and Kelly that can play center or wing, and then you have Paille and Ryder as wingers.

The Bruins have a few different ways they can play the rest of the season.

They have plenty of guys that can be trade bait. The names of several guys have been thrown around, meaning that the Bruins are potentially not done dealing.

They could also stay put and leave themselves the cap room which could be smart with the amount of guys that are going to be looking at pay raises.

Long story short, in my opinion this team is a cup contender for this year as they stand now.