So I'm looking for a simple solution to this problem. I have to div boxes vertically stacked. I'd like the bottom box to remain directly underneath the top box regardless of the height of the top box. This way when I add content to the top box I don't have to adjust to vertical position of the bottom box.
Not enough information
Sounds like you're using absolute position, a common error among the less experienced. What you want is the natural way things work.
How to help you will depend on your code. Please show us either by posting the code (see http://csscreator.com/node/19116), or by posting a link to the page.