在 Digg 上看到可以讓 Mac Mini 使用雙螢幕的工具：Mac mini with Dual Displays。
其實那個盒子就是拐 MacOS，告訴他有一顆 2560x1024 (或其他類似的) 的螢幕。然後再把訊號拆開，輸出到實際的兩個螢幕上...
Update：在 Mac mini dual monitors using DualHead2Go 有提到，需要 SwitchResX 這套軟體設定 2560x1024：
once you receive all the hardware, you simply plug it up in the (somewhat) natural way, mini to dualhead2go, out to two monitors. I added the custom resolution to the system using the SwitchResX tool, which has a free 15 day trial, and then costs $15. This process is fairly painless. You simply open up the SwitchRes control, and in the Resolutions tab hit Custom, then New. Put in 2560 for Horizontal, and 1024 for Vertical, hit Ok, and you're good to go! Shut down your mini, then hook up the Matrox box, restart, and you should be putting along in dualscreen mode.