I just heard that Blogger posts can now be scheduled. When you're done composing your post, look in the lower left hand corner, above "Publish Post". You'll see "Post Options". There you can schedule posts for any time in the future. I used to do this with my old blog and loved it. I used to post clear through my vacations, instead of leaving a long gap of no posts. Admittedly, those posts would have to be timeless---things like quotes and musings---and comments wouldn't be responded to promptly, but I like having this feature.
It's pretty good since Blogger is free, don't you think?
UPDATE: At the present time, this feature doesn't really work. As Chani wrote in the comments, it simply posts your post right away but stamps it with a future date and/or time. I'll change this if/when it ever works the way it is supposed to!!