O'Reilly Media and Wolfram Research are going to be collaborating on a web version of Mathematica.
Called "Hilbert" after the influential German mathematician, David Hilbert, the newly licensed software will be browser accessible and, utilizing AJAX technologies, will emulate the desktop version of the software with remarkable fidelity. "The magic of AJAX will allow OST to combine or 'mash-up' Mathematica with other web-based technologies to deliver and support high quality science and mathematics courses online such as the Calculus&Mathematica courses currently taught through NetMath at the University of Illinois and other universities," explains Scott Gray, Director of the O'Reilly School of Technology.
Hilbert should be available before the end of the year.