What's the best way of converting PDF docs to Microsoft Word format in PHP? This can be either as a PHP script or calling a (Linux) executable (with proc_open()). It just needs to be relatively fast and produce quality Word documents (in 97/2000/2003 format).
Openoffice has a PDF import extension. Most of OpenOffice is scriptable, so you should be able to write a command line interface to perform the conversion. There are many examples on the official UNO wiki.