One of the mistakes web designers often make, especially those that come from a print background, is assuming visitors are coming to a site only through the homepage. It makes sense with a brochure or booklet: you first read the cover and then flip through the pages. You really only need the title on the cover.
But this makes no sense on a website. People are going to be visiting your site from any page they find. For instance, if they’re looking for your organization’s mailing address, they’re going to search for “Your Org mailing address” and probably be taken directly to your contact page.
The biggest mistake you can make is to skip branding on internal pages. Make sure that your logo, address and other important information is just as visible from internal pages as they are from the homepage.