Detecting Duplicate URL’s

In creating a sitemap of my blog, I find a few instances where I have linked to a page with slightly different URL’s. The difference is a trailing slash:

http://www.mydomain.com/myblog/2006/10/23/title-of-post/

vs

http://www.mydomain.com/myblog/2006/10/23/title-of-post

I have found some of them and added the trailing slash, but still have some lingering. How can I detect the location, for example, of the URL’s without the trailing slash? I am thinking there might be a utility that will do this?