Intuitive navigation for users
Create common user scenarios, get "in character," then try working through your site. For example, if your site is about basketball, imagine being a visitor (in this case a "baller" :) trying to learn the best dribbling technique.
Starting at the homepage, if the user doesn't use the search box on your site or a pulldown menu, can they easily find the desired information (ball handling like a superstar) from the navigation links?
Let's say a user found your site through an external link, but they didn't land on the homepage. Starting from any (sub-/child) page on your site, make sure they can easily find their way to the homepage and/or other relevant sections. In other words, make sure users aren't trapped or stuck. Was the "best dribbling technique" easy for your imaginary user to find? Often breadcrumbs such as "Home > Techniques > Dribbling" help users to understand where they are.
Crawlable links for search engines
Text links are easily discovered by search engines and are often the safest bet if your priority is having your content crawled. While you're welcome to try the latest technologies, keep-in-mind that when text-based links are available and easily navigable for users, chances are that search engines can crawl your site as well.This <a href="new-page.html">text link</a> is easy for search engines to find.
Sitemap submission is also helpful for major search engines, though it shouldn't be a substitute for crawlable link architecture. If your site utilizes newer techniques, such as AJAX, see "Verify that Googlebot finds your internal links" below.
A: It's not something we, as webmasters who also work at Google, would really spend time or energy on. In other words, if your site already has strong link architecture, it's far more productive to work on keeping users happy with fresh and compelling content rather than to worry about PageRank sculpting.
Matt Cutts answered more questions about "appropriate uses of nofollow" in our webmaster discussion group.
A: We haven't found a case where a webmaster would benefit by intentionally "theming" their link architecture for search engines. And, keep-in-mind, if a visitor to one part of your site can't easily reach other parts of your site, that may be a problem for search engines as well.
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