Concerns about research, search engines, amateurs vs. specialists, costs of journals and publication issues. Free vs. fee. Metadata as cataloging. Keep one machine unfiltered for use by adults. Selecting vs. blocking.
Problem is that it's based on content.
Didn't describe how to filter. Industrial Strength Web Susan Feldman, Datasearch Liked Northern Light. InfoSeek gives good descriptions. AltaVista good on foreign languages and domain limits. Doesn't use Lycos any more.