Engineered skin, plastic joints, artificial organs, and the like are the focus of Biomaterials Network, a portal run by scientists in Portugal with help from BioMedNet, the well-known free commercial site. Biomat.net offers links to journals, popular articles, and books, as well as a somewhat unfocused list of Web sites. But its meeting page is international and up-to-date, and a catalog of 550-and-counting researchers' profiles may also prove useful. Sign up for a weekly newsletter to get Web links to newly added sites and articles.