Boxee just confirmed that their upcoming Boxee Box made in conjunction with D-Link will have NVIDIA's Tegra 2 chipset. They also mentioned that the Boxee Beta is free for the world to download. Rejoice!
The Boxee Box will be based around a dual-core Arm Cortex A9 chip that should let it zip around various multimedia apps with ease. As for the Beta, its available for OS X, Windows and Ubuntu (but not Apple TV). They also mentioned they'd like to have version 1.0 finished for CES next year.