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The short answer is no, you can't connect two displays to a mini since the device only has one video port.
The longer answer is that yes you can, because it is possible to add a second display via an add-on device either to split the single video output into two, or via an adaptor to drive the second screen through a USB port.
The problem is that at present, the video splitter device (the Matrox unit linked to above) limits the maximum output, such that you are really stuck with two screens no bigger than 1024x768 (native resolution for 15" LCD panels) and the USB solution is not yet, as far as I can see, on the market for Macs. Devices such as
http://us.kensington.com/html/14499.html have been announced, but are either PC only, or not yet available.
http://sewelldirect.com/USB-to-DVI-External-Video-Card.asp lists a device for which beta releases of MacOS drivers have been tested - this device would allow you to use a second display up to 19" (for a native 1280x1024 resolution).
Message was edited by: AndyO