Loki Entertainment Software has released a demo version of their soon-to-be-released Myth II Linux port. The demo is available for both Intel and PowerPC platforms and weighs in at around 60 megs. The mirror list for the demo can be found at
Myth 2 is an excellent 3D real-time tactical game, so be sure to give it a try before the retail release August 9th.
UPDATE: The LinuxGames mirror is located at ftp://ftp.linuxgames.com/myth2_demo/