Biomat.net is a useful community site for the burgeoning field of biomaterials, which aims to create replacement parts for the human body: everything from artificial joints to lab-grown organs. At the 3-year-old site, you'll find links to biomaterials organizations, labs, companies, and more than 100 journals. There's also a long list of meetings that runs to 2004, a directory of researchers, and the all-important jobs board. (Free registration is required to access some sections.) Keep up on developments in the field with a news section featuring articles from journals and the popular media, or browse the monthly roundup of the top five biomaterials Web sites.