I just noticed that the awesome cakes images are gone in this very popular question:
I'm sure there are many other broken images out there and I know you are already aware of this problem (broken images = broken windows).
If legally feasible, I'm suggesting to backup the images in case the question is locked using your friendly hosting partner imgur, automagically changing the images pointing to the new safer sources.*
* It would be cool to backup all of the images not hosted on imgur, but I know it would be a nightmare to maintain.