Vista - How to run 2 screens + 1 HDTV?

Hi i'm new to this forum, as i have a question.
i'm currently running 2 x 19" LG L1942T screens coming from my msi 9600GT via 2 DVI ports.

Now i wanted to "upgrade" and buy a 40" HDTV so that my friends can come over and watch a movie without having to look at the small 19" screen.
but my 9600GT has only 2 DVI ports, how can i have the third output without doing SLI? cuz i'm using a micro ATX board.

i found this video which i think is pretty much what i need.
USB video dongle

will it work on my computer? all 3 outputs at the same time?

another question is.. though i'm only using the HDTV for movie, but can i run a heavy graphic game? maybe like a street fighter 4?
if i output to HDTV by that USB dongle, it will be like a integrated graphic right? so no games?
i tried emailing that guy on the video.. no luck..