Here’s a nice little article on the Industrial Search Engine Marketing blog which is worth going through. Quick Site Audit! Is Your Site Search Engine Friendly? gives a small selection of elementary things which your website should and shouldn’t have if it’s to be “search engine friendly”.
If you think you might not be conforming to the article’s suggestions, get the problem fixed and you’ll undoubtedly see more traffic from Google. Some of the points may seem quite technical, but throw this at your website designers if you’re unsure and get them to confirm all is in order. It doesn’t do any harm to keep them on their toes.