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From Google's perspective: "If those pages are 'non-important' why are you linking to them from the navigation on every page?" I didn't see any right-hand navigation, but I did see navigation on the left side. I do not see an issue with it, however, as this is an important way to get people and search engine spiders to category and eventually product pages. Perhaps you are thinking too hard about this so I will throw my opinion in along with the three other experienced SEOs above who all I think agree on this: Do not nofollow your navigation links. Do not get rid of them. Do not worry about losing "link juice" into those pages. If you truly think a page is unimportant, such as a category that doesn't sell many products, consider removing it from the navigation. Here's an example of how that might be done in this case: I see the fly-out navigation to sub-categories includes all sub-categories for each main category. You could choose the top five sub-cats and then include a "See more categories" type of link instead of showing them all. This could be useful on a long list of sub-cats like the one under "Power Tool Accessories". You could limit the navigation to just two categories deep instead of including the third fly-out navigation level (e.g. Power Tool Accessories --> Bit Sets --> Socket Sets). If the argument is that those third level categories are useful to visitors, thus you want to leave them there, then you have answered your question. Leave them. Don't worry about page-rank. If they are important enough for visitors to want them there and to use them, they are important enough to have their small share of pagerank. If you choose to ignore all of this advice and want them to be there, but not pass pagerank, you can change the way your navigation operates by using a script so there aren't actually any href tags on the page for the navigation. All of the links would be controlled in the script, which would be placed in an external .js file, which could be inside a folder that is blocked in the robots.txt file. I don't recommend it, but that's one way to do it.