In order for me to write on my blog, I have to click on a button at the top right corner of the screen to log-in.
A month ago it disappeared.
I'm going to guess that Blogger sprang another "upgrade" on me. Again.
Today I was noodling about my iGoogle homepage, and I clicked on the 'More' button. On the drop-down menu, about the ninth item down, is 'Blogger'.
Hoping against hope, I clicked on it.
Yay! I'm back!