Oh that sucks. Because the "I'm Batman" blog post was actually started and saved as a draft, before I got tired of tossing and turning last night and wrote the Warehouse 13 post; when posted it inserted itself before the "Warehouse 13" post. (Was that sentence punctuated correctly?)
It should always put posts up by the date & time the user presses the publish post button.
What use would I have for posting things in the past? People coming to the blog's main link will see the top post and think the blog hasn't been updated. Stupid move Blogger.