Sending updates to ping servers has been proven to be a source of good traffic. When you ping, you notify search engines and other services that your website contents have been updated. There are several services out there that helps you to ping your websites.
Here are the few known:
• Google Ping (http://googleping.com/)
• Submit Your Sitemap to Google, Yahoo!, Bing & Ask.com Search Engines (http://www.pingsitemap.com/)
• Feed Shark - Ping your blog, feed, or podcast for free! (http://feedshark.brainbliss.com/)
• http://pingler.com
• Blog Ping now! | Ping That Blog! (http://www.pingthatblog.com/index.php)
• http://weblogupdates.com
• http://pingoat.com
• http://pingomatic.com
Please note that only one ping per day is desirable, otherwise your website may be banned.
If you know any other ping services, please post here.