[Lynne]

Copy the code for the sidebar and then float one left and one right. Add a new field to the blocks table for whether it should be on the left or right. You'll have to then add the field to the admincp. Then, for the code that grabs and spits out the blocks, you would need to group them by which side they go on and then spit out the left ones on the left side and the right ones on the right side.

This isn't something simple someone is going to just whip up for you.