It's funny -- we remember the day that YouTube began supporting plain ole HD like it was yesterday, and we're guessing today will hang in our memory banks for quite awhile, too. Over at the VidCon 2010 conference, YouTube officially announced support for videos shot in 4K (a reference resolution of 4096 x 3072), which means that the famed online clip portal now supports resolutions from 360p to 4,096p. Granted, only a handful of humans even have access to a 4K camcorder, and
