Gotta disagree with this one.  Creating high quality blog content with the same keywords you are targeting on your products page can be a good strategy.  The blog post will add more content related to your keyword on your site, increasing relevancy.  It's also a lot easier to build links to a blog than a product page.

Just make sure to link from the blog post to the product page, and the product page can get a boost.  If you rank really high in Google, you could even get 2 listings for that keyword.  If for some reason the blog content outranks the product page, you can just take that same content and throw it on the product page with a canonical from the blog post.  If all else fails, you can 301 redirect it.