Help With My Blog - The Sidebar Has Moved To The Bottom Of The Page

Looks like you are going to have to track it down one step at a time. first off, the reason I don't use the Google search bar is because I had problems with it before (in the sidebar), being compatible with themes that I was using, so check that first...take it out and see if the blog behaves properly.
Never mind, I see that it is gone*

If that is not it, you are going to have to do it one plug in at a time. It's possible that there are 2 that don't play well together, or one could be out of date.

Did you reinstall the theme files back to the original configuration ?

By the way, it looks fine in FF, and Safari on a 22" and 19" wide screen.