[64 bit] How to verify which video driver is active?

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http://ubuntuforums.org – Hello, I've just installed Ubuntu 11.04 (64-bit). After installation I selected "NVIDIA accelerated graphics driver (version current) [Recommended] from the Additional Drivers dialog box and let it download and install. Once I re-booted the Additional Drivers dialog box says that the driver is "activated but not currently in use" I can go into nVidia X Server Settings and change the screen resolution, etc. This leads me to believe that the nVidia driver is actually being used. A search of /etc/X11/xorg.conf turns up nothing. I guess that this file is no longer used? I ha (Hardware)