Used to be, you could just leave the title blank, or just press the space bar in the title field, and you would automatically get a comic with the name "untitled."
I just tried that a few moments ago, and when pressing the "save" button, the comic instead did not save, and I was redirected to the front page.
People who make massive ammounts of untitled strips demand that you satisfy our slothfulness. At the very least, it would be nice if we were given a nasty message about how you don't like blank title fields instead of redirection to the main page, which just makes us have to type the strip all over again. That just makes the baby Jesus cry.