Tritton's USB 2.0 Video Card for Mac mini
 

Hi, we just found out that Tritton - the company distributing SEE2, the first USB 2.0 SVGA video adapter - is going to develop a version for Mac mini, or MacOS in general. That means when the SEE2 for Mac mini releases, it will be the only option of extending or mirroring desktop area to another monitor. That is unless someone makes one with FireWire 400. The current Windows driver has just been updated to support 1280 x 1024 at 32-bit.

http://www.everythingusb.com/tritton...a_adapter.html