Lynn gave me some very helpful information via PM and I was able to test it out as well.
My post on a test blog went thru just fine, so not all blogs are affected.
However, my test post on Lynn's blog resulted in the same type of error as Devnet.
Under the "save" and "publish" buttons, the text said "saving draft" but never proceeded from there. Normally it would immediately change to "draft saved" followed by the time and date of the save.
Clicking the Publish button caused the page to stall, and eventually displayed a white page. Devnet, I'm guessing this is what you experienced as well?
I have enough information to send to Tech so they can investigate.
If anyone else is experiencing this same problem, please reply to let us know and please let us know if you notice anything else out of the ordinary.