The Yahoo! Search Blog has a post which says that through Yahoo! Small Business customers can now easily submit and authenticate their websites to Yahoo! Site Explorer.

All that is required is to enable 'sitemap.xml' iand your site will automatically be submitted to Yahoo! Site Explorer automatically.

“With this feature, new stores as well as existing stores with 'sitemap.xml' enabled will have access to the toolkit inside Site Explorer. Within a few hours of enabling, you'll be able to locate your indexed pages and the links to your sites, as well as delete pages in the index or rewrite dynamic URLs. To double check if your site was auto-authenticated, take a look in the 'Source' column in the 'My Sites' page in Site Explorer.

For mre information, refer to Yahoo! Stores blog.