Here are some great sites
to visit:

Portland Yoga
Whole Heart Yoga
Maine Yoga
Portland Power Yoga
US City.net
The Yoga Exchange
Holistic Pathways
Open Heart Space
Sanctuary Holistic Health Center
Yoga In Maine
Yoga with Stephanie
Pure Movement Portland
L-OMA.com
Brett Russman
Deep Peace Yoga
Mindful Business Development
The Wellness Solution