English Language Sites

Common Errors in English
An excellent site containing many of the words that are misused in writing and speaking. Each word has a brief history of its origin and common misuse, and a suitable word or words to use instead.

Guide to Grammar and Style
This guide has definitions and examples of common grammar. It also clarifies the usage of words that are often used in the wrong context, such as assure, ensure, and insure.

Dictionary.com
A great site for definitions.