This is a good way to kick off a tussle among interested parties, but hinestly, at this point, most packages work fine. In my opinion your rade-off right now is raw speed (e.g. libxslt) versus flexibility (e.g. 4Suite). All are bug-free enough that you'd have to be doing somethign *very* exotic to run into trouble.
Just pick one or two and try them. http://uche.ogbuji.net/tech/akara/nodes/2003-01-01/python-xslt --Uche -- http://mail.python.org/mailman/listinfo/python-list