Do you need a couple more screens?
A bunch of the notebooks, netbooks, and desktop computers that are on the market today have one or two USB 3.0 ports. Odds are you aren't using those ports to their full potential if you're using them all. If you have a USB 3.0 port sitting unused on your computer, and you would like to add a couple displays to your machine without having to rip it open, the Targus USB 3.0 Dual Video Card is for you.
This external video card needs only a single USB 3.0 port to plug into and supports two additional displays. The USB video card has an HDMI output and DVI output. Each of those outputs supports a maximum resolution of 2048 x 1152, which means HD video is no problem. The HDMI port even supports HDCP so you can play protected Blu-ray content.
It's interesting that this adapter is the first in the industry to use the new DisplayLink DL-3900 chipset for a display product only. The reason this is strange is because this particular chipset supports more than just video, it will also support Gigabit Ethernet making it more appropriate for docking stations than external video cards alone. You can buy the adapter now for $99.