The XRandR support in the driver is not yet stable [1]. The 302.xx line is currently in beta, but will support both XRandR 1.2 & 1.3 at the same time. That part also works flawlessly, however, your mileage may vary in regards to suspend/hibernate, since both I and multiple others on the nvidia forums experience serious problems with resume from either, i.e. the computer hard locks (and doesn't even respond to ssh etc.), which requires you to powercycle it. So while the XRandR is a huge step forward, it is not without problems yet.
[1]: ftp://download.nvidia.com/XFree86/Linux-x86_64/latest.txt shows you the latest stable driver, which is 295.59
ArchLinux has already sent out packages for this release in its stable update channel: https://projects.archlinux.org/svntogit/packages.git/commit/...
(As an aside, it still hardlocks my computer...but according to their forums, they "are working on a fix" for the soon-to-come 304.*)
It's worth noting that just last night they released a stable driver that (finally) supports RandR 1.2. From what I understand this was also a significant change and it may bode well for future standardization improvements like KMS (moves multi-monitor management away from the proprietary TwinView driver components into standard xrandr, for instance, so that is complexity the KMS version will not have to handle).
Fingers crossed that they release this imaginary driver soon. :)