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It could be the category editor deleted your listing, perhaps because he/she saw other listings, or perhaps because of "best fit" issues. KatyCee, did the category seem to shrink at all, i.e., was there any kind of major cleanup? Was the category you were in the most appropriate category, and does your site match up exactly with the category guidlines? Check to be sure the editor didn't add some subcategories and move your site into one of them.
If the site is really gone in your main DMOZ category, I'd start by dropping the category editor a note. If you don't get a reply in a week or so, or if there's no editor listed, you might ask the question in a forum where senior editors can check your URL and view the reason posted for the deletion.
The Google directory isn't yet showing any new results. The directory is updated from the ODP RDF dump, of which there have been 4 or 5 produced on an almost weekly basis since all the problems were sorted out in early February. Prior to that, the last good dump was in about late September of 2002. The Google directory should get updated some time this month if Google returns to their old monthly schedule of downloading the RDF dump from [rdf.dmoz.org...] .