Weblogs API

From their site: The Weblogs.com ping service is used to automatically inform VeriSign whenever you update content on your site. The service receives notification (a "ping") from your site that you have added new content, and if all goes well, Weblogs.com adds your site to a list of recently changed weblogs. If you're not using blogging software that automatically pings Weblogs.com, or if you're looking for more information on how to ping, this page will help you get your ping client up and running.