Yea, you really should delete any files or folders that you aren't using.
If I Google "site:www.danconia.us", I get 150 pages. I'm guessing you aren't using some of them. Lol.
Also, I think most hosts prevent directory browsing, but yours doesn't seem to be the case. You can either add an empty index file in those folders or add this line of code in your .htaccess file:
My signature :)