Looks like version 3.1.12 is out =P http://sourceforge.net/project/showfiles.php?group_id=7586&package_id=72941
dev-util/boost-jam has just been removed from the tree. For the boost-jam functionality, please use the "bjam" USE-flag on dev-libs/boost which will build and install bjam. With v1.34 of boost, I'll introduce a boost-build package.