I, for one, am not ready.
I don't want to change my page!
But, alas, tomorrow is THE DAY.
Facebook will change all accounts over to the new "Timeline" format.
And that means you need a "Cover" image: that large, horizontal image right at the top of your new page.
Take a look at Copyblogger's
Here you will find full, complete directions for creating this new image.
Here are the new, correct dimensions:
Check out Copyblogger and get your new page up and running!
(we'll see if I have time to get mine going by tomorrow...)