WordPress blog by default pings all the ping services when even a post is edited and saved. WordPress blog even pings when some future posts are scheduled. This may get counterproductive and excessive pinging can lead to your blog being banned for spamming. Therefore in case you are heavy user and edit your wordpress blogs very frequently then you must install some pluggins which limit excessive pinging of WordPress blogs.
cbnet Ping optimizer is one such utility which helps you restrict too much of pinging. Chip Bennett, writer of this plugin says
Do you know your WordPress blog pings unnecessarily every time you edit a post? Think how many times you click on “Save and Continue Editing” or “Save” button. Your blog will ping unnecessarily that many times you click on those buttons.
When even the future posts are rescheduled by adjusting the time-stamp, the pinging will never happen. It appears even the latest release of WordPress has this problem. So this plugin is a must for all heavy bloggers using WordPress blog.