I think it'd be a good idea to start including integrated low res thumbnails on images in questions, as at least for the case of my school, Imgur is blocked and half of the sites are just broken image icons all over the place.
I think just having a site specific thumbnail path (ex. stackoverflow.com/thumb), a user content subdomain (ex. usercontent.stackoverflow.com), or a combination of the two. (maybe add compatibility for file attachment for stuff like dump diagnosis and the like?)
Specifically, it could either kick in when the image fails to load from Imgur, or just allowing the user to click on the image for a high res preview from Imgur.
What are everyone's thoughts on this?