This is a slick module that will allow you to split up your category description so that some will show at the top of the page and then the rest will show up AFTER any products or sub categories.  This allows you to get the most important information "above the fold" for your visitors to see, and the balance with your keywords for SEO and additional information BELOW the products or sub categories.

Zen Cart Versions:  1.5.0, 1.5.1, 1.5.3, 1.5.4, 1.5.5