I don't believe the B's have much cap room...if any...but next year there are some interesting players who are eligible for FA. Included are:
Backstrom - G
Gaborik - RW
Bouwmeester - D
Erik Cole - RW
Garon - G
Cammalleri - LW
And most notably, 3 top Detroit forwards:
Franzen, Hossa and Zetterberg
My guess is Detroit will retain, at minimum, Franzen and Zetterberg. I think Minny will do whatever they can to keep Backstrom, but I've read Gaborik might be looking at a contract at around $7+m per year, assuming he stays healthy the remainder of the year...I think he's likely trade bait as the trade deadline nears in March.
The B's likely don't have the cap space to afford these top guys, although they'll have $4.3m coming off the books from Fernandez alone. To afford a top tier guy in 2009-2010, the B's would need to trade someone and free up cap space. Bergeron would be an option but he isn't worth the approx. $5m per year he's being paid, so not likely to find many takers there. Moving Sturm might be an option...I think he makes around $3.5m.
Complicating matters is that the cap is projected to be DECREASED for the 2010-2011 campaign:
http://www.boston.com/sports/hockey/bruins/articles/2008/12/13/salary_cap_will_likely_take_a_hit_in_2010_11/
Edit: I think they also have Glen Murray coming off the books, so maybe there is more room than I thought...of course Kessel is an RFA next year, so that could cost a few bucks to lock him up.