I want to learn to speak English
There is a community in SL for people who want to learn the English language, they have a website:
A community website also:
And a SIM in Second Life:
Virtlantis http://slurl.com/secondlife/VIRTLANTIS/241/64/25
A commercial service is featured in the article:
Stories from Second Life: How Languagelab gave language learning a new lease on life