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" (their words, not ours). Granted, only a handful of humans even have access to a 4K camcorder, and 4K projectors aren't exactly simple to find (or afford), but we couldn't be happier to see YT staying way ahead of the curve here. If you're up for putting a severe strain on your broadband connection (and just pretend that your monitor can actually support a legit 4K feed), feel free to hit that first source link and attempt to watch any of those videos at their "Original" resolution. Godspeed.

[Thanks to everyone who sent this in]