Ways to use Second Life in for ELA instruction.

Collaboration: You can contact people of the same field of interest from around the world.
Interactivity:  You can use videos, presentations, images and weblinks at the same time in one place.

On an elementary level, students can explore the virtual worlds in Second Life and use the experience as a writing prompt.  On the secondary level, students can explore different genre (Shakespeare, poetry, etc) and interact within those "islands".