OntoNotes (http://www.ldc.upenn.edu/Catalog/CatalogEntry.jsp?catalogId=LDC2007T21) covers parts of the PTB, but only for selected expressions.
Besides, I was involved in on-going annotation efforts for coreference annotation of the RST discourse treebank (http://www.ldc.upenn.edu/Catalog/CatalogEntry.jsp?catalogId=LDC2002T07) coordinated by Andrej A. Kibrik/Moscow State University in cooperation with the University of Potsdam, but these annotations have not yet been finalized.
Best, Christian Chiarcos -- Christian Chiarcos University of Potsdam/Germany Collaborative Research Center 632 Project D1 "Linguistic Data Base for Information Structure" snail: Karl-Liebknecht-Str. 24-25, D-14476 Potsdam-Golm office: II.24.2.68 email: chiarcos at uni-potsdam.de web: http://www.sfb632.uni-potsdam.de/~chiarcos tel.: +49-(0)331/977-2664 fax: +49-(0)331/977-2925