Discriminating sites don't put up every link in the universe or try to cover every subject. It may seem, for instance, that Fossil Collections of the World is a great resource, but the site is exhausting to use and apparently exhausting to maintain, since its author has done nothing to it since late 1997. I cherry-pick from lists like these and am grateful for the work behind them, but I think that they will not survive much longer. Original sites are made by people who write about what they know personally, or who write to an audience that they know intimately. To me, they are the real fruit of the World Wide Web.
People can hang small articles on a Web site without having to write a whole book.
I do run across all kinds of cool sites that aren't right for listing, but they're fun to share, so I put them in the weekly newsletter. Low, discount pricing. Over 200 earth science software solutions. Gemstone amethyst necklaces from india. Gemstone amethyst necklaces from india handcrafted by the talented craftsmen of Orissa.