Duplicate content is harmful.

You have a very good site. And you have good keyword combination and getting good traffic from your keywords though if you use the same content for more than one page than it is very harmful for your site, Duplicate contains occurs many problems. It's something you want to avoid as much as possible. In this, people have reported their pages disappearing completely from the search results because of duplicate content. Drupal is a very friendly with SEO. It contains Modules and Files are available for such a problem.
Example
robots .txt File-
In this if we have two pages with the same content than by this file we can say search engine to ignore that page. For that we have to just write
Disallow: /node/
after this any content that's only accessible from a /node/ URL will no longer get indexed by search engines.

BPO CANADA

http://www.bpocanada.com

BPO Canada is an innovative web design and development company focused on building products that satisfy our customers' needs. Whether you want the flexibility and modularity of Drupal for creating an e-commerce, community or corporate site, or a framework for developing a database-backed web application in Ruby on Rails, we have the experience and expertise needed to make your project a success.

With a wide array of services, from web design to SEO, we make sure that all your web related needs are satisfied. With a list of satisfied clients ranging from Fortune 500 companies to start-ups, we deliver exactly what our customers want.

BPO Canada Global Services Corporation ( Canada, India )

BPO Canada Global Services Corporation currently services Drupal Clients across US, Canada and UK.

BPO Canada specializes in Drupal Development. We offer end-to-end Drupal Services.

· Installation

· Configuration

· Customization,

· Upgrades/Porting Sites or modules

· Creating Multi Site Environment

· Building Installer Profiles

· Site Maintenance

· Performance Tuning

· Hosting

· Training

· SEO/SEM

· Advisory Services

· On Demand Support.

Between India and Canada, we have one of the world’s largest Drupal development team. Our Drupal Clients range from startup companies to Fortune 1000 corporations.

We also act as the sole Drupal Development partner for many US/Canada based Web Development firms.

If you want to find more about us, please visit our website

http://www.bpocanada.com