Here are some interesting links regarding Iyengar Yoga:

Iyengar Yoga Resources : A comprehensive website for Iyengar yoga on the Internet.

Official BKS Iyengar Site: Iyengar Yoga website by Ramamani Iyengar Memorial Yoga Institute.

Iyengar Yoga National Association of the United States

Iyengar Yoga: An article about Iyengar from AHealthyMe.com.

Here are some links to specific studios:

Yoga on Centre in Pittsburgh, PA

Green Tara Yoga in Cleveland, OH

Here are some general yoga links:

Yogafinder: A website for finding yoga classes and workshops anywhere in the world.