Okay, looks like Pubsubhubub is working:
Blogger publishes my post.
Feedburner picks up the feed that was just published.
PingShot notifies the Pubsubhubbub node that my feed was updated with a new post.
Funny that FriendFeed doesn't support the publishing part of Pubsubhubbub, their feeds look all messed up in Google Reader.
is it Google Reader's fault, because it doesn't support the Subscriber part of the protocol?
When will we know?