3 SEO Headaches Solved

There are many SEO headaches which I come across on a daily basis, I won't list them all here as I've also a job to do, so where do I start:

1. Products Pages with 2 URLs

Having product pages with '2' different URLs is really quite regular and Magento sites, or should I say developers who don't understand the intricacies of Magento sites, haven't helped the issue, for example these two pages contain the exact same content - Google would most likely call this duplicate content:

http://www.yourwebsite.com/widgets/large-widgets/blue/

and

http://www.yourwebsite.com/large-widgets/blue/