This is an old problem, but I haven't been able to successfully find any solution to it. I have a 3-column fluid layout for my site here. As you can see, the content of the middle column is pushed down beyond the lowest element in the right column. If I just have stuff in the left column, it does the same thing.
I don't know what I'm missing or doing wrong, but I haven't found a solution that works yet to level the main content at the top of the middle column. I deeply appreciate any help.