I saw today a advertisement image for the new MSI GX60 laptop that comes equipped with the AMD 7970M GPU. In that advertisement it showed eyefinity running 3 monitors from the laptop directly by using the HDMI, Dispaly Port, and VGA connections together.
This may not be the very first laptop to do this, but its the first that I have seen that really is catered to mainstream users due to price and availability and also a sign perhaps that we may expect more of this in the future.
It takes a lot of power to run eyefinity, so I would not expect the latest and greatest games to run great on a system like this but if your into older games especially things like say the source engine games, this could be an interesting idea for you.