Some free utilities:
http://sourceforge.net/projects/pdftohtml/
http://www.nzdl.org/html/prescript.html (python-based)
pstotext
ps2ascii
ps2html
ps2a.sh
I wonder, could mobilereaders tell about its experiences with these packages? Quality and Speed considerations are important, because it seems that some people wants a reflow package in their own ereader, not in the PC.