Writing lab and formatting guides
http://owl.english.purdue.edu/
A helpful site with online writing labs and formatting guides.

Formatting guides
http://www.dianahacker.com/resdoc/
A helpful resource for research and documentation in humanities, social sciences, history and sciences.

Dictionaries
www.merriam-webster.com/
http://dictionary.reference.com/

English exercises
http://bcs.bedfordstmartins.com/writersref6e/Player/Pages/Main.aspx
A log-in protected source of great writing, grammar and research exercises.

Association of Writers and Writers Programs
http://www.awpwriter.org/
A helpful resource for writers with writing programs, contests, careers and more.

Other writing center pages
http://writingcenters.org/owcdb/index.php
The International Writing Centers Association's page with a list of writing centers organized according to type.