Wikipedia

The free encyclopedia
http://en.wikipedia.org/wiki/Main_Page

Yahoo! education

Easy-to-use online dictionary
http://education.yahoo.com/reference/dictionary/

yourdictionary.com

English-English dictionary online
http://www.yourdictionary.com/

weblio dictionary(For Japanese only)

Search across a variety of dictionary
http://www.weblio.jp/

radiko.jp(For Japanese only)

Internet radio
When boiled down to various…、it hears and refreshes also with -- and radio!
http://radiko.jp/