Here you will find a very comprehensive list of Language Arts websites. I've taught language arts for two years, so naturally this is the area that I will have the most resources. Find a dead link? Let me know: dramaldy@yahoo.com
General Resources
Grammar
Literature
Poetry
Spelling/Vocab
Writing
General Language Arts Resources: (Reference items, Lesson Plan sites, etc.)
Literature/Reading: (Authors, Web sites to specific novels, tools for teaching reading, etc.)
The Shakespearean Homework Helper
Sherlock Holmes Museum
Spelling/Vocab -- These web sites are primarily geared towards elementary students, however, they can be modified for older students.