Ping
A ping is a mechanism by which a blog notifies a server that its content has changed. A signal is sent to one or more “ping servers,” which can then create a list of new material. Open ping servers, let other web services subscribe to a list of blogs that have recently pinged them. Aggregators use results from ping servers to tell subscribers which items on their subscription lists have fresh material.
Wordpress Update Services
Many blog authoring tools, like Wordpress, can be set to automatically ping one or more servers each time a post is created or updated. For your Wordpress blog admin, Go to “Options / Settings”, then “Writing”and scroll to the bottom of the page to find a box called “Update Services.”. You can add additional Ping services to the list.
 
  Regular listings | ping-o-matic.com http://pingomatic.com Added: Feb 04, 06 Report
A multi-ping-service - inform search engines and other services that your blog has updated. Free
| Alexa: 1432
IP: 72.233.56.139 | | brainbliss.com http://feedshark.brainbliss.com Added: Nov 12, 07 Report
Multi Ping service. Ping your feed, blog or podcast. Free
| Alexa: 19839
IP: 74.53.236.190 | | blogsearch.google.com http://blogsearch.google.com/ping Added: May 19, 09 Report
Google Blog Search search engine. Use this add page if your blog is not listed in Google's blog search results - Free | Alexa: 1
| | pingler.com http://pingler.com Added: May 25, 09 Report
Ping service - Free | Alexa: 3640
IP: 209.236.116.62 | | pingmyblog.com http://pingmyblog.com Added: Nov 25, 09 Report
Multi-ping service. Updates major blog directories.
Nov 24, 09 - Received an error when running online
Jan 8, 10 - Received errors
| Alexa: 44868
IP: 67.222.103.115 | | pingates.com http://pingates.com Added: May 25, 09 Report
Multi-ping service - Free | Alexa: 34289
IP: 50.116.67.142 | | autopinger.com http://autopinger.com Added: May 21, 09 Report
Ping blogs and podcasts. Registraion required.
| Alexa: 35742
IP: 50.61.241.134 | | ping.in http://ping.in Added: May 25, 09 Report
Multi-ping Service - Free | Alexa: 30358
IP: 50.22.75.79 | | pingsalot.com http://pingsalot.com Added: May 22, 09 Report
Blog ping service - Free
| Alexa: 428078
| | blo.gs http://blo.gs/ping.php Added: Nov 25, 09 Report
This service is updated by Pingomatic.com | Alexa: 45701
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