Category Slugs = 404s?

Here’s what I think is causing the problem:

<?php query_posts($query_string . '&cat=-98, 101, 102'); ?>

should be:

<?php query_posts($query_string . '&cat=-98,-101,-102'); ?>

The way it is now, it’s telling WordPress re-run the old query, but give me nothing from category 98, AND only pull posts from categories 101 and 102. I’m guessing you want it to be re-running the original query, leaving out 98, 101, and 102.