When you’re editing your Web pages, it’s probably a good idea to start with the assumption that everything is visual noise.
Just having the navigation appear in the same place on every page with a consistent look gives you instant confirmation that you’re still in the same site—which is more important than you might think.
Too-subtle visual cues are actually a very common problem. Designers love subtle cues, because subtlety is one of the traits of sophisticated design. But Web users are generally in such a hurry that they routinely miss subtle cues.
Testing one user early in the project is better than testing 50 near the end.
I don’t usually talk much about memorability because I think the best way to make things easy to relearn is to make them incredibly clear and easy to learn in the first place. If it’s easy to learn the first time, it’s easy to learn the second time.