A listing in the Yahoo directory can provided hundreds of uniques a day, so its with some suprise that I realized I hadn't noticed a recent change.
Now, instead of listing sites alphabetically, Yahoo lists them by default by popularity. Also the results are paginated, with 40 listings per page. This means that if you're at the bottom you're going to end up getting both less PR and less traffic than you used to get from these links.
Also, since the sites listed first should tend to maintain their popularity, once you get on the first page or to the top you shouldn't have to worry about dropping that much.
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