Got the display driver working on 32 bit guest (screenshot: i43.tinypic[dot]com/2i8bsxx.png), 32 bit win 7 host. dxdiag reports 3D acceleration is working, but any time I try to use it, in a game or even to run the windows assessment thing, the program trying to use it crashes. Still, it's nice that I can now change the screen res, and switch the VM out of fullscreen mode without it crashing

Here's how I did it:
install GA with this command: vboxwindowsadditions-x86 /depth=32 /force /with_d3d /xres=1366 /yres=768
it will error but that's fine, go to the install folder in program files
give yourself ownership of this folder and then give yourself write permissions
edit vboxvideo.inf:
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in the [Version] section add this line:
Compatible = 1
under [Manufacturer] change the line to this:
%ORACLE%=Model, NTx86
change [Model] to this:
[Model.NTx86]
Now at this stage I did a little tinkering so I'm not exactly what is necessary, it could be you can go straight to the next stage, or it could be that a restart is required, or it could be you have to run "vboxdrvinst driver install vboxvideo", it might even be that you have to run "vboxcontrol setvideomode 1366 768 32" first, but that seems unlikely.
Go to the device manager
Right click the generic display adapter
Click update driver software
Browse my computer for driver software
Type or browse to C:\Program Files\Oracle\VirtualBox Guest Additions
Click next and you're done
Sadly, can't get shared folders to work. The shared clipboard works though, which is handy. An odd thing I've noticed is no matter what I try I can't get it to my screen's native res, 1366x768, it keeps giving me 1360x768.