I don't know about any that can do 2 external DVI displays. I'm pretty sure that notebooks with docking stations with a VGA-out and a DVI-out can run 2 external monitors like that, but the main display would probably have to turn off (2 displays of any type max). Maybe if it was a dual-DVI (for those super-resolution monitors, like the 30" monsters), you could split the DVI signal to two monitors?
Matrox makes a couple products for adding more monitors onto a notebook than the default 2. They might have something that is for DVI.