The big problem is that several courts require documents to be submitted in Word Perfect format, and last I checked OpenOffice was not even inporting WP, let alone saving a workable output.
Look at the beta for openoffice 2.0, it now handles WordPerfect. Scroll about half of the way down this page:
http://www.openoffice.org/dev_docs/features/2.0/index.html
-Jared