coan.net: Yes, that's true. ISPs are obliged to keep their DNS lists updated and the only thing we can do for that is to broadcast the up to date information and "ask them" to accept it. There is a RFC describing this problematics and all serious ISPs should follow it. If not, I hate to say it again but it's really not our problem if some ISPs don't accept the general rules of the web.
Actually, I can improve BrainKing's detection system to switch to IP-encoded image paths when someone is accessing the site using IP address instead of domain name.
Generally said, it is an important performance improvement to separate images to another server and it's what we want to keep. I have recently implemented a smart detection system to BrainKing and the site recognizes when the image server is down, then it switches to internally handled images, until the image server becomes alive again. It is to ensure that BrainKing will always show images, no matter if the image server is running or not. However, it cannot handle DNS problems of users, of course.