This week I was working on a prototype layout for one of our internal tools and I decided to try out the CSS3 multi-column layout module.
Currently only Mozilla and Webkit support multi-column styles, but since this is an internal tool I have a greater degree of fredom in adopting graceful degradation and progressive enhancement.
What I found out is that Firefox and Webkit have implementes the ambiguous parts of the standard very differently, resulting in some weird behaviour. A simple 4 column layout results in inconsistent UIs depending on your browser of choice.