I've been on record a few times as valuing quality over quantity in this year's draft, basically because the Steelers are relatively set and cannot afford to have to waive propects like they've been doing too many times.
However, recent readings about the uncertainty over all our FAs coming back (combined with yesterday's court ruling) and this article at SI.com are well on their way to making me swing my opinion. Looks like trading down if BPA and need don't coincide might be wise, given the impossibility to sign college FAs immediatly after the draft.
This article argues that there might be a flurry of trades well into the 6th and 7th rounds, as teams cannot afford to hope to lock up that UFA who wasn't drafted, fast after the draft. So organizations which do their homework (like ours) won't get the early mover advantage in 2011.