NX 4 is pretty new and a complete rewrite of its predecessor. Would be great to see this in gentoo sooner or later. What do you think?
From http://www.nomachine.com/download-preview.php :
"Please note that the quality of the software is sub-alpha and it is not intended to replace the stable 3 releases in any way yet. Note also that most features introduced in the new Player depend on the presence of the NX 4 installation on the server. If you want to get a real sense of what NX 4 will be, please be sure you install the NX Player on the client and the NX Virtual Desktop Workstation on the computer you want to access from remote."