Duplicate content problem

[ayetti]

I am having an issue with duplicate content that I can't seem to figure out.  I got rid of the www.mydomain.com by modifying the htaccess file but I can't figure out how to fix theproblem of  mydomain.com/ and mydomain.com

[overtake]

http://httpd.apache.org/docs/2.0/misc/rewriteguide.html

Under heading 'Trailing slash problem' presuming your running apache.

[Vivamedia]

Add a canonical URL that points to the URL that you want to use.

or

Some reading:

http://www.seomoz.org/blog/canonical-url-tag-the-most-important-advancement-in-seo-practices-since-sitemaps

[ayetti]

both great answers, the htaccess change didn't work for me cause I am a helpless noob, but the rel=canonical worked like a charm, thanks all your the best.