It is just a simple site run by one person I believe.
"What is Imgur?
Imgur makes sharing images with the Internet easy. It can be used to share pictures with friends, as well as post images on message boards and blogs. You can manipulate the image a number of ways and automatically submit it to popular sites such as reddit or digg. You can also view popular user-submitted images in the gallery. Best of all, Imgur is completely free."
Ain't got a clue why you got that warning never happened to me. I am using FF with No-Script, below is a list of blocked items with No-Script, looks pretty harmless to me.
There are the usual "googly" links, "projectwonderful" is part of the advertising part of the site, don't know what "dt00.net" is though.