As I'm sure you are aware, the Redskins don't have any picks in the third and fourth rounds of the 2011 NFL Draft. So after they make their pick in the second round (41st overall), they'll have to wait until the third day of the draft to make a pick in the fifth round.
There is always the chance that they could trade up into the third and fourth rounds, but the problem is that they don't have a ton of ammunition in the form of later draft picks to do so. According to Mike Jones at the Washington Post, the picks that the Redskins do have later in the draft don't carry much value.
Say the Redskins use the 10th pick and wanted to try to move back into the first round because they were worried a Jake Locker, Andy Dalton or Phil Taylor wouldn’t be left by the time their second-round pick came around. Well, that 41st pick with a collection of fifth-, sixth- or seventh-rounders aren’t very attractive. Third- and fourth-rounders are a different story.
If the Redskins had kept their middle round picks they would have a pretty good opportunity to trade back into the first for one of those players. Of course, they can mortgage the future with a pick in next year's draft, but the pick isn't worth as much as an equal round pick would be this year.
Because they moved those picks already, the Redskins will likely have to just stay where they are and make due with their picks. The opportunity always exists however to trade back into the first round and acquire more picks that way.