Outlined below are some precautionary measures you can take to increase your chances of acceptance. Directories are different than search engines. People often confuse directories and search engines, thinking that they are the same. This is not true. Search engines use spiders or robots to index web sites, while directories use people.
Directories have a smaller, but cleaner index.
Directory editors don't look at the HTML or link popularity of your site. Your site needs to be fully functional, well designed and feature valuable content to be listed in a directory. Forget about software and web-based submission applications, and submit your site yourself. Directory submissions require an appropriate category and a description of your site, which software can't write. Directory editors can reject sites if they find them to be of poor quality.