I found this plugin a while back, it's called the CBnet Plugin optimizer
What is does is make sure you don't spam by pinging to much. I add a whole list of ping services to my Wordpress blogs and have to make sure when uploading a bunch of posts that the services don't get too much ping action which leads to a black.
So, I am making CBnet Plugin optimizer plugin of the day.
You really want to have this installed on all your blogs.