I did a search on google and came up empty-Cant find a site anywere that has this directory plugin installed. Just install it to your blog and see if you like it,If you dont you can allways remove it.
I use that plugin. It looks good and functions fairly well. Couple of points though: 1, the default spam filter choice (secureimage) causes a post error. the submitted link still posts but the error doesn't look professional; 2, permalinks are a bit awkward to set-up depending on your current Wordpress permalinks structure; 3, there's a post on the plugin's forum page that indicates a security flaw. The plugin's creator says it has been fixed but (shoulder shrug, outward palm-up) who knows; and, 4, the short-tag has to be included in a page or post using the non-visual editor (i.e the HTML editor) otherwise it wont show up. Other than that, it's a nice little plug-in. You can view it at JournalXtra.com (it's listed as "Link Directory" in the top menu).
There still doesn't seem to be a decent WP directory plugin, there are only 2 or so and both are really unusable IMO...