There are approximately 30,000 new citations added each month. There are powerful ways to limit or expand your searches, and you can figure most of these out by studying the main page. This is the best single source on the Web for finding full text versions of copyrighted magazine and journal articles. It uses most of the same syntax that AltaVista uses. Then, if you want, you can order a copy of the full text of the article.
Most articles cost about a dollar.
This is the best way to find E-mail discussion groups. Like the newsgroups, there is an E-mail discussion group on practically any topic you can imagine. Then enter a search string. There is no really great way to find people or e-mail addresses on the Internet. Most of the search engines and directories provide a way to search for people.