USGS has published a poster of the Great Tohoku Earthquake in Japan of 11th of March 2011. It seems that the upgrade from 8.9 to 9.0 Mw is definitive, and like that appears now in most of documents from national geological surveys. (Link to the poster a the end of the article).
The poster is very interesting, and it compiles the basic tectonic/geophysical data needed for understanding an earthquake like this.
Find the poster here: http://earthquake.usgs.gov/earthquakes/eqarchives/poster/2011/20110311.php
PDF version for printing in a plotter: ftp://hazards.cr.usgs.gov/maps/sigeqs/20110311/20110311.pdf
(Thanks to Ángela Pañeda via Facebook!)