Alexei, See this thread on the MTL-devel mailing list archive: http://www.osl.iu.edu/MailArchives/mtl-devel/msg00435.php As you can see from the mailing list and the download area, there has not been much developer activity since September. There is also an MTL 3 prototype called MXTL at: http://www.mpi.nd.edu/~jsiek/mxtl.html See http://www.osl.iu.edu/MailArchives/mtl-devel/msg00373.php and http://lists.boost.org/MailArchives/boost/msg10435.php Best regards