I don't know if anyone is aware of the wonderful resources that can be downloaded for free at the Internet Archive http://www.archive.org
The Archive is scanning the library of Princeton Theological Seminary and many great commentaries and reference works are available for download and dozens of titles are appearing every day. I place them in a folder and then connect them to BibleWorks in my ERMIE. This goes a long way of rectifying the lack of commentaries.
Kevin