Upload image selection to imgur, and pipe the image url to xclip. Based on http://sirupsen.com/a-simple-imgur-bash-screenshot-utility/

upimg

#!/bin/bash

function uploadImage {
  curl -s -F "image=@$1" -F "key=486690f872c678126a2c09a9e196ce1b" https://imgur.com/api/upload.xml | grep -E -o "<original_image>(.)*</original_image>" | grep -E -o "http://i.imgur.com/[^<]*"
}

import shot.png 
url=`uploadImage "shot.png"`
echo $url
echo $url | xclip -selection c
rm shot.png

Depends upon imagemagick's import utility, curl, grep, and xclip