I really want to use slashdot type functionality for a site and I think their source code is open, but I'm not sure how easy it is to use. Is anyone else using it or know of any non-slashdot installations of it?
Sadly it looks like a dead project to me. They do have a page which lists /code sites they know about but it's broken. If you download the latest release file you'll see that the most recent datestamp is 2006, though someone does seem to have been fixing bugs as recently as last year.
Project on sourceforge is here http://sourceforge.net/projects/slashcode/
Basically anything slashcode/slashdot does can be done better in drupal or wordpress, it's a very 90's site in look, thinking and functionality.