Blog pinger, i thing all blogger know it. Blog pinger or Pinger tool is such application made to help poeple notify search enggine that her/his blog has been updated. ping is an XML-RPC-based push mechanism by which a weblog notifies a server that its content has been updated, i dont know how it's work exactly but some issues that I believe using ping tools can help you to make your blog have a good visibility in search engine. Here is 2 of most powerfull ping tools (in my opinion) which referenced by my friend that i usually use to ping some of my blog
Ping Device (http://pingdevice.com/)
Ping device have a simple view, but trust me it's give you advantages more than it's looks. ping device can perform mass ping and give simple report how far the system has worked, just fill the url in the text area then click start.
Ping Farm (http://pingfarm.com/)
Same as tool above, using ping farm you can not only perform mass ping as usual but also perform blog pinging through RSS URL.
there are many website that offer blog ping service with farious function and advantages, do not get confused which is best don't lose focus cause your content is everything.