I performed a quick crawl of your website and immediately found part of the problem - it looks like your HTML sitemaps is still linking to the pages in question.
With that in mind, I would NOT recommend using the canonical tag here. Instead, I would check whether or not these pages have links pointing to them. If they don't, then just change the URL in your sitemaps to the correct location. However, if you do have inbound links to these pages then implement a 301 Permanent Redirect to the appropriate page.
I didn't conduct a comprehensive crawl but if you'd like your own data then please check out Xenu Link Sleuth. Also, I think inside the SEOmoz PRO campaign you can click on each individual URL and it'll show you the referring links as well.
Hope that helps and good luck!
UPDATE: Actually, the problem looks like it's coming from your source code. You have your old URLs still located on the page under
. A parallel issue is 'products.php' and 'Products.php' both resolve completely different pages so you might want to look into 301 redirecting them.
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