Here is an interesting site for semi-advanced users looking to learn some more technical vocabulary: http://www.technicaljapanese.com/
There are quite a few posts, but I found the posts on academic fields http://www.technicaljapanese.com/?p=91 and arithmetic http://www.technicaljapanese.com/?p=26, http://www.technicaljapanese.com/?p=31 particularly interesting.
