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There is no advanage, but there is disadvanatges. There s the fact that now you have a 301 redirect to the new url. every 301 redirecte leaks link juice. there is also the conversion factor, where you really want clear clean data, haveing the .html makes things look that little bit messy. Most people rewite the other way for this reason, to get rid of the extentions. Try uising the old url, does it work? I dont use wopprdpress of develop in php, but php being a server side technology, the webserver will need to know that the page is php. So i assume what the dev has done is rewite the urls, so when .html is used, it rewrites to a url that the web server can understand. When you do a rewite you need to do a 301 redirect from the old url to the new url so that you dont get duplicate contnet, you can not have both redering the same content. UYou also need to change every internal link on the site so that they link directly to the new url, you dont want your internal links going thougth a 301 as they leak link juice, leaking link juice on internal links that you have full control over is an un-necessary waste. See http://thatsit.com.au/seo/tutorials/friendly-urls-using-url-rewrites-with-iis This is for Microsoft IIS serrver, but the concept is the same

Check out BlueGlass. They often write about infographics on their blog (this post http://www.blueglass.com/blog/avoid-ordinary-infographics-with-these-7-steps/ is from yesterday), and they also offer infographic services (I can't personally vouch for them, but did see information about it on their home page).

My client only sells to their dealers, not to the public. So, if I were a dealer, I would gladly link to the manufacturer who is working hard to provide better information about the products. I am going to approach them about making a form letter to either mail out or email out and we can link them to a private page to get the badges.... see what happens. I will most likely report my findings on SEOmoz