|I don't know who this is, but I was beginning to HATE her when I thought she stole my blog!|
Some frantic web searching and some helpful folks on a blogger discussion board revealed that the blog had not, in fact, been hacked. The custom domain had somehow expired. So no more "www.teacherninjas.com" for me.
I'm sticking with plain old "www.teacherninja.blogspot.com" for now.
I'm going to go enjoy my lowering blood pressure now...