www.anonymizer.com, www.IDzap.com, www.privada.com, www.somebody.net, and www.zeroknowledge.com. We cannot vouch for the effectiveness of any of these products. Varieties of books about privacy in general and privacy on the Web are available through your library or local bookstore. In addition, the Federal Trade Commission provides useful information about online privacy on its own Web site, Site Seeing on the Internet.