<p>The subjects vary from finance to women's studies to biology and law, and the colleges include MIT, Yale, Michigan, Berkeley, Notre Dame, and many others.</p>
<p>"You can peek into some college classrooms around the world, experience lectures in text, audio, or video at any time, and, in some cases, take the final, all without leaving home -- and all for free.</p>
<p>Yes, the ivory tower gives something away for nothing. Determined to make its mark in cyberspace, the Massachusetts Institute of Technology was the originator of this free-class approach. In 2002, it started OpenCourseWare by posting 50 classes online for public consumption. Today, almost all of the school's courses are available online. MIT OpenCourseWare has published 1,899 courses to date, and more than 250 universities have joined the effort to spread higher education to the masses this way.</p>
<p>MIT assists with the operations of the OpenCourseWare Consortium of colleges around the world involved in the trend -- schools in Australia and Vietnam recently signed on -- while other schools post classes independently.</p>