American Libraries Online
American Library Association
Center for the Book 
Library of Congress
Internet Public Library
I Love Libraries.org
Library Journal Digital
The Library Network
Library of Congress
Library of Michigan

Organizations
ACE/GED Test Site 
Literacy.org
National Assessment of Adult Literacy
National Institute for Literacy
Oakland Literacy Council
TOEFL (Test of English as a Foreign Language)

Resources                                                  
Dave's ESL Cafe  
English as a Second Language
PBS Literacy Link
(GED + Basic Workplace Skills)

Activities 
Activities for ESL Students  
English as a Second Language (National Literacy Institute)
Gallaudet's ESL Lessons (practice)
Interesting Things for ESL Students
Owl ESL Resources (writing lab)

Tutor Resources
Adult Education Resources (GED) 
The Internet TESL Journal 
Owl Resources for Teachers
Tutor Tips