Search Engine Watch is a guide to search engines, gives insights on how they work, etc. Listservers and Newsgroups Indiana University has a good listing of Listservs and Newsgroups relating to Chemistry .
Highest activity is in the chemed-l and sci.chem groups.
Use Dejanews as an index to find articles from listservs and newsgroups. Professional Societies , including the American Chemical Society are good sources of information on the web. Most specialized encyclopedias are on the web only by subscription. The Web version of the Encyclopaedia Britannica is an excellent source for general articles on scientific topics, and for biographical articles on noted scientists. Articles contain the full text of the print encyclopedia, as well as links to some relevant Web sites outside Britannica.