When you post an image in a thread with the [ img ] tags, make sure it’s hosted on your own webspace or CGTalk’s new image space.
A good example of leeching an image is as follows: There’s a thread on CGTalk about Harold and Kumar and you want to post an image from the film. You find a cool picture of the Indian guy on the Internet Movie Database. Instead of hosting the image on your webspace (if you have one) or Imageshack or one of the many free image hosts on the Internet, you put the URL of the image from IMDB.com. Now each time the thread is viewed, the image downloads from the remote server (IMDB.com), which in turn takes a chunk out of their bandwidth.
Although the larger sites probably do not have bandwidth issues, other smaller sites have bandwidth quotas, and by leeching images from their site, you’re risking putting some of those people over their quota.
So in retrospect, assume some responsibility and take the extra step or two to host the image elsewhere.