A sitemap is good for users and perfect for search engines. WP Simple Sitemap is a WordPress plugin that automatically lists all your posts.
Contact me here. Describe the problem as good as you can, your plugin version, WordPress version and possible conflicting plugins and so on.
The best way to contribute is to spread the word, link to this page, blog about WP Simple Sitemap or give me feedback. All kinds of feedback are helpful to me. Suggestions and bug report are also welcome.