To make a long story short, I just upgraded my PC with an i7 920 processor and an ASUS P6T motherboard. Things worked out so that moving from 6gb of RAM to 12gb was nearly free - So I did it! Now I have Vista 64-bit with 12gb of ram, tuned up nicely.
Aside from just using the PC in a manner which would do so normally, is there any way, settings, et cetera, to coax Vista or applications to use RAM more liberally? I'm familiar with Vista SuperFetch, so maybe there are some settings here to make things happen better, or will Vista just use as much as it can normally?