Jean-Pierre Serre (and also see Wikipedia) is one of the most eminent mathematicians alive; he was part of Bourbaki in the later stages, and he has been awarded many mathematical prizes. So it is a pleasure to watch a video of him explaining how to write good mathematical papers. He does this by explaining how to not to write mathematics which is why his talk is entitled How To Write Mathematics Badly.
You can forgive the amateurishness and poor sound quality of the 56-minute video for the sageness of the advice he gives. I don’t know when the talk was given but if it was recent he is doing very well for a man in his eighties.
You can find the video on Google video at Jean-Pierre Serre – How To Write Mathematics Badly and is a must see for postgraduate students who appear to make up the bulk of the audience.
Thanks to ComplexZeta for the link.