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Try Open site explorer and "link opportunities" for any pages that are 404 and have external links.  Webmaster tools will also show you pages that are 404 that have external links (though it doesn't show you the links) and Ahrefs has a similar tool

I agree with Phillip, If your site is established and ranking well for brand terms, then making this change shouldn't effect the over all branded rankings, especially seeing as your not taking the brand out completely. The keywords should ideally be the main focus of the page, thus having your keywords in the front of the title should boost rankings for those targeted terms. I have always used and recommended using: Main Keyword | Secondary Keyword - Brand Name On a side note: Something i recently started noticing (I don't have any resources to refer to) is that quite a few of our competitors don't use the "Keyword | Keyword - Brand" formula, instead they use "Great [Keyword] deals from leading [keyword] suppliers - Brand Name" and they seem to be ranking really well. (More descriptive words that entice users) Perhaps Google is starting to prefer "natural" looking titles (including stop words, adjectives etc) and not putting much extra value on "optimized" title tag formula's (Keyword | Keyword - Brand) This is just a thought and haven't researched it much. Greg

Site-map is very important for telling Google about our pages,  Using site-maps has many benefits, not only easier navigation but we can get better visibility by search engines. You can submit around 35000 pages in your site-map.  It is only way that you can immediate say to search engine about any changes in your site. Your question is about including product pages in site-map right? so ya, you can submit your product pages in site-map, if you are adding your product pages search engine will recognize your pages,  so it will increase your site visibility and visitors.

Thank you Ben. Strangely we are just doing this on our paginated range pages as they currently show as duplicates at present too. Jon

TTS- Hosted version can be set up to pass you all the SEO value but it has to be done right...... Wordpress will help you in SEO and ease of use in maintaning the blog.......always been a great blogging tool and now is also a great CMS. Doesnt solve your issue, but if you could figure out how to use it, you will be much better off.