I've seen alot of features for directories come and go over the last few years. But one of my favorite new features of a link directory is the ability to provide a screenshot of each links website in the directory listing. A great example is www.jupiter-directory.info. Notice they've got a 90x70 thumbnail screenshot available for all links in the directory providing a preview of the website you would see if you click on the link. IMO, this is an excellent feature to provide to link owners, and a new twist to link directories.