im posting this as a suggestion, if you are bored, have a lot of time on you r hands or fancy a programming challenge give it a go. I would like to program this myself but dont have the required knowledge at the moment.
(and hey - if this makes money i want a cut )
a device driver that sits between the graphics card and the kernel and allocates a given amount of the physical system memory to the graphics card for use. On a machine with a decent amount RAm you could assign an extra 16MB of graphics memory to the card at very little performance loss and a major graphics power increase.
this is only theory , but would i work?