Possible Wordpress Ping Problems
So I read somewhere that if you make a post on Wordpress and schedule it to post at a later date it would still ping whichever servers you have in your ping list.
Make a few of those and you get banned which almost happened to me - 15 posts in less than an hour and a half!
There is a plugin called Post Schedule Ping Optimizer that's free for now I guess - http://www.problogtools.com/ has it, although it runs with cron which at least for me is not always working 100%