Links that are placed higher on a page (hierarchy-wise) are considered to be more useful to the user and therefore most likely weighted more than links that appear lower down on a page.
A link from the Yahoo directory is just about the best link money can buy. For the fee of $300 a year you will receive a link back to your website in the appropriate category.
When buying links you should keep in mind that they will not have a very old age and will as a result usually not boost your site as much as an older link would.
The age of a link is supposed to hold a lot of weight with the search engines (especially Google) because it is something that is very hard to manipulate and control.
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