So I'm talking to a guy on IRC (freegz), who uses the NVIDIA driver. It seems that when he converted from non-graphical grub2 to graphical grub2 (which we've changed relatively recently in F17), the NVIDIA driver stopped working. It sounds rather like the issue with nomodeset and graphical grub2 raised in this thread on test:
https://lists.fedoraproject.org/pipermail/test/2012-May/108022.html so, it sounds like someone might need to check into how to make nvidia play nice with graphical grub2. I'm guessing it's possible as ubuntu seems to default to graphical grub2, but I thought it'd be worth a heads-up. thanks! -- adamw