General

http://www.starfall.com

http://www.cogcon.com/gamegoo/gooeyhome.html
This site has many Language Arts activities for Grades K – 2
http://www.learnenglish.org.uk/grammar/archivegrammar_games_index_page01.html
A huge collection of online grammar games.  Grades 3 and up

Spelling

You can add your own spelling words for activities

http://www.netrover.com/~kingskid/Safari/safari.htm 

http://teacher.scholastic.com/tools/spelling.htm

http://www.kidsspell.com/

Dolch Word Lists already created:

http://www.netrover.com/~crose/dolch/dolch.htm