Here's an update - for those still interested.
I've spent quite some time fiddling with this bloody resolution and here's the lowdown:
1. Intel does in fact not bother releasing a distro independent driver for their GMA950 - or 945 or 810 or whatever this chip is officially called. Their shy attempt at a Linux driver is for RHEL and might or might not work with any given distribution - RHEL included...
2. 915resolution hack only works with VESA in my case which makes smaller fonts look horrible and gives a headache after a while. On top of that it makes my video and TV hardware useless since VESA provides no proper video overlay support.
3. There is apparently no publicly available GMA950 3rd party driver that supports 1680x1050@60hz natively. 1400x1050 seems to be hitting the ceiling as for wide-screen. Above that and everything becomes 'virtual'.
4. If you are in the process of acquiring a new system with a 1680x1050 monitor that you would like to run Linux on I would strongly recommend to stay away from anything sporting the GMA950 chip.
5. I'm actually wondering how the fellas with the new Intel MacBook who want to use Linux on their machine handle this. AFAIK the new MacBooks all have GMA950 chips.
6. try before buy

cheers
cp