This hack will help you to display advertisements above/below blog posts in
blogger's new -out of beta- version.I will explain the hack with screenshots for your ease.This hack is indeed an extension of the previous one.
Step a.Go to template>edit html.
Step b.Scroll down to reach the 'main wrapper' division.
Step c.Change the values of 'Show add element' to yes and 'locked' to false.
Step d.If all done fine,go to page elements and put your code and bravo.