Planet13 - 5:16 pm on Mar 22, 2011 (gmt 0)
did you do anything "wrong" that you might have been penalized for (and which you have corrected)?
Because if it is a manual penalty, then I think that Matt Cutts has said that a reconsideration request can help reduce the time it will take to rank again.
But that is for a manual penalty.
If you search youtube there are a couple of videos from google about reconsideration requests and penalties.