There may not be any more weight, necessarily, to .gov or .edu links, but a link from, say, a PR5 .edu that is embedded in relevant content will most assuredly pass more weight than a link in the side bar or footer of a PR5 .com that sells links. If I were a betting man, then I would definitely bet money on that. But you guys like to argue too much. That's just my .02. Take it or leave it. I like my fat .edu links.