sgod - 1:08 am on Feb 4, 2013 (gmt 0)
@sgod how were you able to make the right sidebar go to the top of the main content div?
The trick is that the ad only looks like it's in the right sidebar, but it's actually in a div that loads just before the "content" div. The ad div is the same width as the sidebar, so that when I float it right it pushes down the sidebar but not the content. Then I use a media query to center it and make its width 100% on narrow screens, and this causes it to appear centered between the header and the content area.
I feel like I'm forgetting a detail here because I'm not looking at my code right now, but that's the gist of it.