Do you need traffic to your website? Website pinging (http://www.theinfostride.com/forum/index.php?topic=20017.0) has been very useful in getting free traffic to your website. Pinging enables your website contents to be sent to search engines and other services as soon as they are posted.
Visit the link below for a list of RPC and RPC2 Services to Ping:
RPC and RPC2 Services to Ping - Hints for Webmasters (http://www.theinfostride.com/forum/index.php?page=ping_servers)