Running two Apple displays from one Macbook Pro?

I have two Apple displays with mini-display ports.  I have ONE Macbook Pro with ONE mini-display port.  Problem.
I purchased this USB 2.0 to DVI Display Adapter from Monoprice but still can't figure out how to get my mini-display ports to work with this.
Is this even the right product? 

You can use another DVI, VGA, or even HDMI display for far cheaper with this adapter, US$60 plus shipping:
http://eshop.macsales.com/item/NewerTech/VIDU2DVIA/
Warning: Results may be unacceptably laggy.
But a converter to Mini DisplayPort is quite expensive, US$150 plus shipping:
http://www.atlona.com/Atlona-DVI-to-Mini-DisplayPort-Converter-p-17859.html

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