“It’s Greek to Me!” http://teacher.scholastic.com/activities/athens_games/gameGreekToMe.htm 
(Multiple choice quiz in an Olympics themed game format on words with Greek roots.)
Identify definitions by using clues found in words' roots.

Google Dictionary http://www.google.com/dictionary 
Explains how words are used and puts them in sentences. 

Wordsmyth Dictionary and Thesaurus http://new.wordsmyth.net/ 
Free online dictionary with definitions written at three levels, synonyms, antonyms, examples,
There is a downloadable widget that allows your to look up any word on any web page. Create custom glossaries and quizzes that you can print. Register (free) and you can publish them to the web. 

Scholastic Word Wizard Dictionary http://teacher.scholastic.com/dictionary/ 
This dictionary includes vocabulary for grades 3–12. Word Wizard is also on all Scholastic.com student pages! Your students can access the dictionary from their favorite Scholastic activities, articles, and learning games. (Uses the Wordsmyth technology)

Scholastic Vocabulary Teacher Guides

Teaching Vocabulary with Francie Alexander http://www2.scholastic.com/browse/article.jsp?id=4503 
Scholastic’s Reading Resources Network is putting the focus on vocabulary. Here, you'll find activities and resources to use in your classroom, a model lesson on video, and an online development session for vocabulary instruction. Plus you’ll discover a plethora — there’s a great vocabulary stretcher — of other resources.

Word Knowledge: Vocabulary Instruction http://teacherweb.esu1.org/files/ahill/HowtoTeachTier3Words.pdf 

How to Teach Vocabulary-  Prof. Franz Ludescher, MAS http://www2.vobs.at/ludescher/pdf%20files/How%20to%20teach%20vocabulary.pdf 
http://www2.vobs.at/ludescher/Word%20Files/How%20to%20teach%20vocabulary.doc Professor's homepage http://www2.vobs.at/ludescher/ 

Strategy Toolbox: Vocabulary http://www.iptv.org/pd/strategicreading/rws_stratvocab.cfm 
From the Strategic Reading Resource Center, Iowa Dept. of Education

How to Teach ELL's Vocabulary: Motivating Students to Learn New Words in the ESL Classroom
http://esllanguageschools.suite101.com/article.cfm/how_to_teach_vocabulary#ixzz09fs9EG7G

Teaching Vocabulary To Advanced Students: A Lexical Approach http://www3.telus.net/linguisticsissues/teachingvocabulary.html 

Vocab Bingo Template http://www.redshift.com/~bonajo/vocabbingo.xls 
Vocab Bingo Directions http://www.redshift.com/~bonajo/vocabbingo.htm 

Vocabulary in Beginning Reading http://reading.uoregon.edu/voc/index.php 
The Institute for the Development of Educational Achievement (IDEA) in the College of Education, University of Oregon.

Interactive Word Walls http://www.theschoolbell.com/Links/word_walls/words.html 

Articles from Reading Rockets

Multisensory Vocabulary Instruction: Guidelines and Activities http://www.readingrockets.org/article/286

Questions About Vocabulary Instruction http://www.readingrockets.org/article/3471
By: Partnership for Reading (2001) . This article answers four common questions teachers have about vocabulary instruction, including what words to teach and how well students should know vocabulary words.

Vocabulary: An Introduction http://www.readingrockets.org/teaching/reading101/vocabulary
By: Partnership for Reading (2001) . The scientific research on vocabulary instruction reveals that 1) most vocabulary is learned indirectly, and 2) some vocabulary must be taught directly.

Teaching Vocabulary http://www.readingrockets.org/article/9943
By: Linda Diamond and Linda Gutlohn (2006) . Consider some excellent lesson models for teaching vocabulary, explaining idioms, fostering word consciousness, instruction for English Language Learners, and mnemonic strategies.

Vocabulary: Instructional Guidelines and Classroom Examples http://www.readingrockets.org/article/3473
By: Partnership for Reading (2001) .This article provides examples of classroom instructional techniques as well as specific activities for helping students build their vocabularies.

Developing Academic Language: Got Words? http://www.readingrockets.org/article/26892
By: E. Sutton Flynt and William G. Brozo (2008) . Concerns about how to build academic vocabulary and weave its instruction into curricula are common among classroom teachers. This article reviews the research, and offers some practical suggestions for teachers.

Teaching Vocabulary http://www.readingrockets.org/article/9943
By: Linda Diamond and Linda Gutlohn (2006). Consider some excellent lesson models for teaching vocabulary, explaining idioms, fostering word consciousness, instruction for English Language Learners, and mnemonic strategies.