Choose the Qur'anic Studies tab at the top of the page for your choice of two translations (or view them side-by-side).
Also use this site for its collection of exegetical works or tafsirs. The link above takes you to the translations; click on Tafsirs in the left margin to select from the several available commentaries.
Research on Terms and Concepts:
A major scholarly resource for the field of religion, this online encyclopedia contains articles on key Islamic concepts and history that might be useful for background material on your texts.
A comprehensive resource that could be useful for other perspectives on issues related to Islam.