This is something I just quickly hacked together when I was wanting to redo my website.
It takes a wordpress XML export file and converts it into individual files in Markdown. Also it adds the title and date tags.
The output should fit straight into the Benjen entries folder.
Sources:
HTMLTOTEXT: https://github.com/aaronsw/html2text
CONVERTWORDPRESS: http://code.activestate.com/recipes/551792-convert-wordpress-export-file-to-multiple-html-fil/
BENJEN: https://github.com/daeken/Benjen
Usage: WordpressConversion.py (filename)
NOTE: I am not the author of these I just edited them a bit to suit my own purposes