If you have a blog, then this is great service to have in your tool box. Ping-O-Matic is a service that syndicates your blog post to all of the important search engines. I use it once I have publish my articles on my ICONICA blog and it pushes the information to all the search engines to tell them “I have new content, come and index me”. Instead of waiting for the search engine to make its way to my site on it own which could take days. I get it index right away.
Ping-O-Matic is a service to update different search engines that your blog has updated. They regularly check downstream services to make sure that they’re legit and still work. So while it may appear like they have fewer services, they’re the most important ones.