Where the Oakland Raiders Stand: Defense

The other day I outlined the moves that have been made on the offensive side of the ball. today the focus shifts to the defense. The Raiders have made a lot of noise on that side of the ball franchising Nnamdi Asomugha, re-singing Tommy Kelly to a mammoth contract, and adding Gibril Wilson and DeAngelo Hall. The only departures thus far are are Tyler Brayton and Warren Sapp. This has been an area where the Oakland Raiders have spread money around like Pac Man at a strip club, but have they done enough?