I've been using http://ezpicshare.com/ for all my one time picture hosting needs. Some no-name site thats been up and working fast and flawlessly for a year and supports just about any image type and up to 10MB in size. I'd use dropbox but I'm too lazy to login and upload then paste. So much easier to use a image hosting site to do all the work for you, plus resizing .
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Well, I meant the images used in threads etc. When the article system Joomla is in place we might use dropbox or another server.
Don't have any numbers but I assume it will be high bandwidth wise.