DICTIONARIES:

yourDictionary.com
http://www.yourdictionary.com/
An extensive website with dictionaries in many languages, a thesaurus, word-of-the-day, specialized dictionaries, links, and more

Online dictionary & thesaurus web linking lookup reference tool.
http://www.voycabulary.com
Lesson
A website where you can "paste" any text or url, and the entire text becomes hyperlinks which you can click on for a
dictionary definition. You need Javascript to view this page.

The Wordsmyth
http://www.wordsmyth.net
An easier online dictionary

VOCABULARY:

Follow the link from Wordsmyth to:
Wordsmyth Words of the Week
http://www.wordsmyth.net/wotw.shtml
This website chooses a weekly theme, such as "the election" and gives you related vocabulary. It has a link to a great looking crossword puzzle, too.

Dave's ESL Cafe's Vocabulary Links
http://www.eslcafe.com/search/Vocabulary/

SPELLING

A Spelling Test
http://www.sentex.net/mmcadams/spelling.html

The English Zone Spelling Page
http://members.home.net/englishzone/spelling/spelling.html

Interactive Quizzes
http://webster.commnet.edu/grammar/quiz_list.stm
Scroll down to the Spelling Quizzes.  (Advanced)

READING WEBSITES WITH GOOD INTERNAL DICTIONARIES OR VOCABULARY EXERCISES:

NY Times News Summaries
http://www.nytimes.com/learning/students/pop/index.html
Here is an index to short current news stories.
Level 62 and up
Lesson

Readers Digest
http://www.readersdigest.com
You can find articles and other features, such as Hangman ( a game for practicing spelling and vocabulary)
 

CNN Website  (Western/Pacific Literacy Network)
http://literacynet.org/cnnsf
You can find current and past CNN news stories. Read them in the abridged for full version. You can view story outlines and there are numerous useful activities, a multimedia component, and related links for stories.
(Reading and Writing)
Level 62 and up; some activities could be used in 52, 54, or 58