As of January 1st, the following important change to the Federal Rules of Appellate Procedure is scheduled to go into effect.
Rule 32.1. Citing Judicial Dispositions
(a) Citation Permitted. A court may not prohibit or restrict the citation of federal judicial opinions,
orders, judgments, or other written dispositions that have been:
(i) designated as “unpublished,” “not for publication,” “non-precedential,” “not precedent,” or the like; and
(ii) issued on or after January 1, 2007.
See Proposed Amendments to the Federal Rules of Appellate Procedure from the US Courts web site.
Source: Moritz Legal Information Blog