I wasn't personally able to attend NVISION, but luckily the folks over at Modders-Inc have published a rather good recap event of the first IDF-like event held by NVIDIA a little while back.
The video has great coverage of the GeForce LAN, case mod competition and the famous Mona Lisa rendering by paint ball and more.
Have a look for yourself below:
If you love HD (and who doesn't?), you can check out the high def version of the video over here.