It is something we all want and has been requested many times. What it will need though is a big re-write of the theme engine, maybe to use twitter bootstrap or something similar. However as we are currently a small team it would take someone to step up to the mark and put in the time and effort to do for 1.6, then to have the community create nice new themes to work with the new engine. Problem is, old themes would suddenly become incompatible without a lot of thought and that would alienate people. It is going to be a difficult decision but I fear the only way to move ahead will be to drop tables in favour of divs everywhere so why not introduce it with a complete new engine. We are always open to contributions from the community.