Blogger's automated system has determined that this blog might be a spamblog and has disabled it--just before my Cancun trip and my planned Picture of the Day!
If you're reading this, it means they've unblocked it after determining that this is not, in fact, a spamblog. I hope you're reading this shortly after I write this.
Update, 8/1/08: Apparently this was a large problem affecting many blogs. I'm glad the folks at Blogger restored everything so quickly.