A few years ago, when Greg had some kind of problem with his server, we couldn't upload photos to Greg's image hosting service for several days. Von posted imageshack as a free alternative site to upload pictures that people wanted to post...I've been using it ever since then. By using it, I don't have a size restriction on the photos that I upload and they don't go away after a few weeks.
Your employer might have the site blocked? (Can you see Von's pictures from your work 'puter? I think Shoop uses it, too...don't know who else)
My boss has blocked yahoo, youtube, facebook, twitter, myspace...etc.