If you look at Fedora 16 bug reports, you'll see that the 'open' driver stack (nouveau, mesa, etc.) only became capable of doing "everything" required by Compiz, and KWin, just a few days ago. A recent kernel update is necessary, too.
So, unless you want to be an alpha tester; switch to Nvidia's proprietary driver -- even though it probably won't be compatible with Qt on Wayland in the future.
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When you switch to Nvidia's proprietary driver, be sure to blacklist any nouveau and mesa modules wshich appear in 'lsmod' output. Even though it doesn't support 3d, you should back up your xorg.cong file before allowing the NVidia installer to mess with it, their 'save the old one' only saves one copy. (So, if it dies the first time, and you run the Nvidia Installer a second time, your pre-Nvidia configuration is destroyed. Do NOT save under the name 'xorg.conf.old', that's the name which Nvidia will overwrite if it already exists.)
If Centos has an NVidia package, just use that- it saves you the trouble of installing the Kernel 'Development' Source Headers form the Nvidia Driver compilation step. But both ways work, it's not hard to do either way.