Easy level

1) Reading
http://www.eslpartyland.com/quiz%20center/quiz.htm#Reading

2) Good Reading Exercises
http://www.lclark.edu/~krauss/toppicks/reading.html

Intermediate level

3) Remarkable Translation Page
http://www.rikai.com/perl/HomePage.pl?Language=Ja

4) Science
http://www.nytimes.com/learning/students/scienceqa/index.html

5) Culture Capsules
http://www.lclark.edu/~krauss/ortesol98/home.html#master

6) Comics
http://www.snoopy.com/comics/peanuts/index.html
http://www.dilbert.com/comics/dilbert/archive/

7) Famous Quotations
http://www.pacificnet.net/~sperling/cookie.pl.cgi?

8) Alice in Wonderland
http://the-office.com/bedtime-story/classics-aliceinwonderland.htm

9) Interesting Reading Texts with Exercises
http://www.geocities.com/yamataro670/readinglab.htm

Advance level

10) Daily News Quiz
http://www.nytimes.com/learning/students/quiz/index.html

11) Interesting Materials about Foreign Cultures
http://www.nytimes.com/learning/students/quiz/index.html

12) Some On-line Magazines
http://www.nationalgeographic.com/ngm/
http://www.sciam.com/
http://www.newsweek.com/
http://www.time.com/time/
http://www.usnews.com/usnews/home.htm

13) Some Other News Sites
http://www.yomiuri.co.jp/index-e.htm
http://www.asahi.com/english/english.html
http://www.usatoday.com/
http://abcnews.go.com/

14) Free Electronic Books!
http://digital.library.upenn.edu/books/