I read somewhere that it's best to limit the number a list of links to no greater than five. The reason being is that people can instantaneously recognize things in groups of give but have to count if it is more. An example is people count six items as two groups of threes. I guess what they are trying to say is that if it increases the cognitive load, it has a higher probability of being perceived as cluttered or overwhelming.
With that being said, it's sometimes very difficult to do so because well... everything is important. The categories of an eBay or an Amazon or in this example, the properties of Yahoo! You just can't leave one out, they are all too important for a couple of reasons: One, a lot of times these companies are trying to communicate the breadth that they have and Two, if you hides them behind something, you can't expect people to ever know about them (A bunch of Google's features I still don't know about because they hide it behind their "more" and "even more" buttons.
Anyways, I thought Yahoo! managed this issue quite elagantly... well, as elegant as it was going to get by combining a little tag cloud action with their traditional list of properties. What they do is they highlight the three properties that you use the most by increases the font sizes of those links so what you have is two layers of links. The top most being the links that you are looking for so it increases the affordance while making sure that the other parts of the site are still exposed.
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