A while ago, Yusdi Santoso made an announcement to this list about a new browser-based interface to matplotlib, called WebLab, intended to be a free replacement to Matlab. Since that original announcement, there have been quite a few improvements made to WebLab; in addition, WebLab is no longer restricted to run under Windows XP like it was when the original announcement was made. I am not all that familiar with matplotlib but, for having tried briefly WebLab, I am most impressed. I would encourage anyone interested in producing high quality graphics using a free Python based tool, as well as science instructors who have students that need to produce graphs, to have a look at WebLab. It can be found here: http://www.physics.ox.ac.uk/users/santoso/Software.WebLab.html André