I would like to introduce a brand new service. It is a automated blog search directory pinging service named Poll-n-Ping. It is different from Ping-o-matic and similar services, because Poll-n-Ping monitors the blog (actually the feed) for changes and when it detects changes it will automatically ping the blog search directories.
You can checkout the service at http://www.mohanjith.net/pnp. All this comes free of charge, but donations are always welcome. Right now there is no limit on the number of blogs that can be monitored by a single user. If you want your blog to be submitted to all the blog search directories that we add support from time to time, you will have to visit Poll-n-Ping regularly.
Soon I plan to add alert service Poll-n-Ping, the subscribed users can receive notification mails or IM when content changes, blog goes offline, and/or blog comes online. However this will be a paid service unless I receive enough donations to support the hosting.
Poll-n-Ping has Turbogears under the hood :-).
Hope you will find the Poll-n-Ping service useful.