Beta 5 of Ardour3 is now available for Linux and Mac OS X.
** OS X Intel (32 bit build) - http://ardour.org/files/Ardour-3.0-13072.dmg
** Linux 32 bit - http://ardour.org/files/Ardour_32bit-3.0beta5_13072.tar
** Linux 64 bit - http://ardour.org/files/Ardour_64bit-3.0beta5_13072.tar