English Tutorial

• alt.usage.english
• English International Exercises
• Learn English from British Council
• Interesting Things for ESL Students
• Randall's ESL Cyber Listening Lab
• learn English as a second language
• The Virtual Language Centre
• American English Pronunciation

English Dictionary

• Merriam-Webster Collegiate
• Encarta World English Dictionary
• Cambridge International Dictionary
• Onelook, which searches over 500 dictionaries at a single stroke
• The American Heritage Dictionary
• Word Net

Encyclopedia

• Encyclopedia Britannica
• Bartleby.com: Great Books Online
• Microsoft Encarta Encyclopedia