It appears that pending software modifications, U.S. criminal case documents filed on or after November 1, 2004 (unless they are sealed) will now be available via PACER. This is due to a change in the privacy policy restricting online access to criminal documents.
For those unfamiliar with PACER (Public Access to Court Electronic Records), it is an electronic public access service that allows users to obtain case and docket information from Federal Appellate, District and Bankruptcy courts, and from the U.S. Party/Case Index.