I'd still like the full-resolution photos available, but scaling down the image included in the post is good idea.
In fact, Imgur already automatically produces scaled-down versions of uploaded images. For your example image, I just need to add an
l before the
.jpg extension to get an image that's scaled to fit in 640x640:
.jpg. Stack Exchange could also extend the custom image sizing behaviour they added for profile pictures (
?s=128) to allow resizing to the actual max-length on each site (630 here on beta).
The image upload control has been updated to insert images as links pointing to the image URL. This helpfully ensures that the full-sized images will always be available, even if they're not embedded in the post.
[![bike locked to railing](http://i.stack.imgur.com/8IlR6l.jpg)](http://i.stack.imgur.com/8IlR6.jpg)]