Offensively, the Patriots are set at quarterback and have a very solid offensive line. Sebastian Vollmer proved he was a dominant tackle, shutting down every end he faced (including Dwight Freeney). This gives the Patriots more depth at offensive line, something they have actually lacked in years past.
In terms of running back, the Patriots could use help, but the situation is not terrible. Laurence Maroney is a below-average every down back in the NFL, and will crack off a big run now and then. Last season, he was healthy, and he posted decent numbers, averaging just below four yards per carry.
The Pats do not need to kill themselves to find a starting, pro-bowl running back, but adding a back-up who can complement Maroney would be helpful.
In terms of wide receiver, the team has some questions. When Wes Welker returns, he would be the obvious number two behind Randy Moss. Behind Wes would be Julian Edelman, who was very good filling in for Welker, and showed a lot of passion in the playoff games.