Animal Diversity Web - This comprehensive site is sponsered by the University of Michigan, places each animal in its proper classification, and includes information about each animal.
Living Things - Living Things is a comprehensive topic with many sub-topics. 'Individuals' deals primarily with the anatomy and physiology of plants and animals. 'Families' addresses the systems for classification of plants and animals. 'Neighborhoods' considers the interactions of living things with the world around them. 'Circle of Life' features plant and animal life cycles.
Earth Observatory - Here you can explore coniferous forests, temperate deciduous forests, deserts, grasslands, rainforests, shrublands, and tundras .
Biomes - Discusses the five major biomes, Aquatic, Deserts, Forests, Grasslands and Tundra.
Major Biomes of the World - This module presents basic content on the distribution and nature of the world's major biomes.
Blue Planet Biomes - Major biomes include deserts, forests, grasslands, tundra, and several types of aquatic environments.
Biomes

The Psychology Hall of Fame - Biographies of Psychologists.
The History of Psychology - Welcome to the History of Psychology Web Site. The site provides a gateway for teachers and students to over 1000 World Wide Web resources related to the history of psychology.
History of the Psychology - A TimeLine of psychological ideas.

Yahoo Directory of Economists - Biographies of famous economists.
New York Stock Exchange - The NYSE is by far the world's largest market and includes a broad spectrum of market participants, including listed companies, individual investors, institutional investors and member firms.
Fantasy Stock Market - They will give you $100,000 of Fantasy money to trade stocks listed on the US Stock Exchanges and keep track of your portfolio and rank you against the other players.
Yahoo Finance - Great site for information on stocks.