Books You Should Have
To Kill A Mockingbird
Learn why Harper Lee's classic character Scout is a great example of how to teach early reading and writing:

Good Night Moon
Great book to read to toddler over and over again:

Links

Wikipedia
Free, multi-language, online encyclopedia. No advertising.
Web English Teacher
Comprehensive site for learning about writing.
Webster's Revised Unabridged Dictionary
The 1913 edition of Webster's Dictionary and Roget's Thesaurus. No advertising, no popups, etc.
AllWords.com
Free English Dictionary with multi-lingual search, specialized dictionaries, crossword solver, and creative writing resources.
SitesForTeachers.com
Links to hundreds of educational web sites

Free Tools

Online Spellcheck
Free online spelling checker. Copy and paste an entire document into a form and this checker will mark all unknown words in red.
Find and unscramble words
This utility will unscramble words, find words that rhyme, and find words with any number of missing letters. Two different wordlists may be selected. This is a very useful and powerful tool.

Publishers

Heinemann
Heinemann, a member of the Reed-Elsevier family of professional and educational publishers, is today the leading name in professional development books and resources for teachers.
Zaner-Bloser
Zaner-Bloser is one of the premier publishers of research-based reading, writing, spelling, handwriting, and study skills programs. Zaner-Bloser's mission is to make a significant contribution to the education of children in pre-kindergarten through eighth grade by publishing materials of the highest quality.
Universal Publishing
A new company with educational products for Pre-Kindergarten through Grade 6, Universal Publishing is dedicated to developing quality products that are classroom tested and proven to get results. They offer effective learning materials at prices you can afford.