Problem Report Corpus
http://www.cs.cmu.edu/~marmalade/reports.html

Andrew Ko, Carnegie Mellon University

First 10,000 lines of POS-tagged text extracted from
files: apache, eclipse, firefox, linux, openoffice.
Tagged using Stanford Log-linear Part-Of-Speech Tagger.

Kristina Toutanova, Dan Klein, Christopher Manning, and Yoram Singer (2003)
Feature-Rich Part-of-Speech Tagging with a Cyclic Dependency Network.
Proceedings of HLT-NAACL pp 252-259  http://nlp.stanford.edu/software/tagger.shtml