Readquarium - online reading activities

PBS Kids - lots of reading games

Fun Brain - some on line books you can read and some cool language games

Adapted Mind - stories, poems and informational passages you can read and practice answering comprehension questions.  Pick your grade level.

Reading is Fundamental - many games, activities and online books

Mr. NussBaum - passages with questions to practice reading comprehension 

Context Clues
Writing and Word Study

Turtle Diary - games that practice many language skills

Idiom Game - learn the meaning of idioms.  Also has parts of speech practice and other opportunities to learn about how language works

Capitalization/Punctuation Practice

Verb Tense