Academy of American Poets (lots of goodies here for the poetry maven)
www.poets.org/

Ask Oxford (source for properly using the English language)
www.askoxford.com/

B.J. Pinchbeck's Homework Helper (homework assistance from kids)
school.discovery.com/homeworkhelp/bjpinchbeck/

Book Browser: Readers' Resources (huge resource site for Net-based book lovers)
www.bookbrowser.com/Resources/Index.html

Bulfinch's Mythology (plenty of info on Greek and Norse mythology, Arthurian legends, and tales of Charlemagne)
www.bulfinch.org/

Carol Hurst's Children's Literature Site (lots of reviews and resources pertaining to kids' and young adults' lit; geared for teachers, but well worth parental surfing)
www.carolhurst.com/

Central Booking (bookworm haven)
www.centralbooking.com/

Children's Literature Web Site (good source of info about kid lit)
www.acs.ucalgary.ca/~dkbrown

Classic Reader (lots of online versions of classic, i.e. public domain, literature)
www.classicreader.com/

Classical Atlas Project (home page of the Barrington Atlas of the Greek and Roman World, the only modern-day map of the classical world)
www.unc.edu/depts/cl_atlas/

Discovery Channel Student Guide (many interactive writing and homework resources)
school.discovery.com/students/

Dr. Grammar (get grammar info online)
www.drgrammar.org/

Edgar Allen Poe (everything you wanted to know about the troubled literary genius)
dcls.org/x/archives/poe.html

Encyclopedia of Monsters, Mythical Creatures and Fabulous Beasts (just what it says, and a fascinating read)
webhome.idirect.com/~donlong/monsters/monsters.htm

Encyclopedia Mythica (online encyclopedia of all things mythical)
pantheon.org/mythica/

English Server (site devoted to disseminating thousands of documents, most related to the arts or humanities)
eserver.org/

English Zone (lots of general English help)
www.english-zone.com/

Fact Monster (online almanac, dictionary, encyclopedia, and homework help)
www.factmonster.com/

Grimm Brothers (undiluted Grimm Brothers fairy tales)
www.nationalgeographic.com/grimm/

Gods, Heroes, and Myth (informative source site)
www.gods-heros-myth.com/

Gutenberg (great e-book source for public domain publications)
www.gutenberg.org/

Handspeak (good site for learning American and International Sign Language)
www.handspeak.com/

HBO4Kids (site helping kids learn the value of a dollar, and how to earn a few)
www.hbo4kids.com/

Idiom Site (informational site for American idiom and slang)
www.idiomsite.com/

Internet Public Library
www.ipl.org/

Internet Public Library Pathfinders Subject Index (research and category guides to the IPL database)
www.ipl.org/ref/QUE/PF/

Itools (lots of language and research tools here)
www.itools.com/

Language Cop (online editing service -- send in your text and Language Cop fixes grammatical and syntax errors)
www.languagecop.com/

Language Tools (a wide selection of thesauruses, dictionaries, and Web-based translators)
www.itools.com/lang/

Library of Congress Online Catalog (if you're hunting for a book and only have partial information, this is the site to begin with)
catalog.loc.gov/

LibrarySpot (links to all sorts of reference sites)
www.libraryspot.com/

Memoware (thousands of public domain books free for the downloading)
www.memoware.com/

Merriam-Webster Collegiate Dictionary
www.m-w.com/

NetLibrary (great source for finding downloadable e-books)
www.netlibrary.com/

New York Public Library: Digital Library Collection (collection of 60,000+ images relating to arts, humanities, performing arts, and sciences; scheduled to be completed by 2004)
digital.nypl.org/

OneLook (a variety of dictionaries)
www.onelook.com/

Online Literature Library (treasure trove of classic literature)
www.literature.org/

Online Rhyming Dictionary
www.rhymer.com/

Pink Monkey (book summaries, notes, and study guides)
www.pinkmonkey.com/

Poynter (great journalistic resource)
www.ponyter.org/

Project Gutenberg (huge compendium of public domain literary works, mostly classics)
www.gutenberg.net/

Purdue University Online Writing Lab (many interactive writing resources)
owl.english.purdue.edu/

The Quotations Page (excellent site for quotes of all kinds)
www.quotationspage.com/

Reading Is Fundamental
www.rif.org/

RefDesk (tremendous informational resource)
www.refdesk.com/index.html

Roget's Thesaurus
asadz.com/thesaurus/

Seussville (home of everything Seuss-related; lots of interactive goodies)
www.randomhouse.com/seussville/

Shakespeare and the Internet (good jumping-off point to explore the life and works of Shakespeare)
shakespeare.palomar.edu/

Shakespeare Online (all of Shakespeare's works available online)
www.shakespeare-online.com/

SpellCheck (go here to check the spelling of any text block you choose)
www.spellcheck.net/

Story Book 2000 (storytelling site for younger kids)
www.kids-space.org/story/story.html

Strunk's Elements of Style (the grammar and usage guide, available for sale at this site but with much of its content abstracted and available for the clicking)
www.bartleby.com/141/

Thesaurus.com (online thesaurus)
www.thesaurus.com/

Visual Thesaurus (highly graphical synonym finder)
www.plumbdesign.com/thesaurus/

Wordcentral (dictionary and language site for younger surfers)
www.wordcentral.com/

Words, Words, and More Words (for lovers of the English language)
www.wordwizard.com/

Writer's Corner for Kids
www.cbc4kids.ca/general/words/writers-corner/default.html

Writing Better (good grammar and usage guide)
www.amherst.edu/~writing/writingbetter/

Your Dictionary (excellent online dictionary)
www.yourdictionary.com/

More to come...