I just wrote a set of equal height fluid columns that allow you to anchor a button to the base of each column. It’s all done in pure CSS so performance is great.
It’s based on some of the other equal height solutions I’ve seen out there before; just combining them and taking it a few steps further.
You can check out the code here: http://jsfiddle.net/tonyjwalt/Q4PkR/embedded/result/
