Other
Bhagavad Gita: Introduction
A long essay on the Bhagavad Gita. Describes the History of the text and its major themes.
Other
Bhagavadgita the Divine Teachings
A page with links to information on the Bhagavad Gita. These links include a full translation, commentaries, a summary, and an essay outlining the seven main teachings of the book.
Wikimedia
Wikipedia: Bhagavad Gita
Wikipedia provides very detailed information on the Bhagavad Gita, the epic poem of Mahabharata that is revered in Hinduism.