I have from time to time filed writs of error coram nobis, most recently in United States v. Graner.
Courtesy of CrimProfBlog here is an excellent case reviewing the writ of error coram nobis. The court discusses the history of the writ and the three part test to considered. Note they cite extensively to United States v. Denedo.
The writ of error coram nobis is of ancient lineage, tracing its roots to sixteenth century English common law. See Sawyer, 239 F.3d at 37. Its original purpose was to promote respect for the judicial process by enabling a court to correct technical errors in a final judgment previously rendered. See United States v. Denedo, 129 S. Ct. 2213, 2220 (2009). In the United States, the office of the writ has expanded well beyond the reopening of a final judgment to correct technical errors. See id. In federal criminal cases, the writ is now available as a remedy of last resort for the correction of fundamental errors of fact or law. Trenkler v. United States, 536 F.3d 85, 93 (1st Cir. 2008).