<< They may be slow, but for an adult education class in basic computer learning they're plenty fast. Network them so they do have access and see if anyone would be interested in doing an hour a week class some evening. >>
My first thought was along these lines as well. Perhaps add Internet basics to the course as well. Otherwise, your church could donate them to local charities, ie. shelters, food banks, etc., many of which are run by churches as well.