OneLook Dictionaries searches over 300 online topical dictionaries and provides links to the word and to the homepage of those dictionaries in which your term has been found. The Great Globe Gallery has wonderful graphics of an amazing amount of categorized maps. Loading times are lengthy. The Old Farmer's Almanac is a long-time staple to those who are interested in weather forcasts, seasonal offerings, and weekly wisdom. Science Learning Network is funded by the National Science Foundation and truly makes science fun.
Topics are of a wide variety, and link the visitor with educationally oriented sites.
Discover Magazine hosts a searchable site that provides full articles from their publication as well as access to the current and recent issues. It also suggests sites related to your topic. Science News Online presents selected articles from its hard copy magazine in a searchable format and by date of publication. Many articles are full text. Biology BioChemLinks is a biology and chemistry education resource center with links to interesting sites for beginning through advanced biologists.