[astroglide]

you can get cardbus display adapters (expensive) and whatnot, but generally speaking this is not a remotely common situation and there are little ways to pull it off without a hack like converting your svideo out to dsub with an adapter and that sort of thing. if this is something you really want, look for esoteric brands that are purpose-built for this sort of behavior.

your best chance with standard stuff would probably be with a docking station/port replicator that might have dual video outputs, but you can't assume that just because something has dvi and dsub outputs that it will actually produce 2 separate displays. more often than not it's going to be 1 output signal with 2 choices of connection.