Yes you heard it, Google says that non-human submits can effect your page rank negatively unless prior approved! :O! I was wondering if Google has this agreement with wordpresses auto submit, as it might be effecting everyones page rank.
What happens is that when you post, we send a ping.
That goes to http://pingomatic.com and from there other services are notified. Whether or not Google follow those pings I do not know.
I cannot see that Google is suddenly going to ignore or penalise pings like this. It is how WordPress has done things since forever. It would be much much worse to expect people to do it. Other blogging services also do the same things.