ImageBot, is a super-handy extension for Firefox that lets you batch upload images to ImageShack or Photobucket. It's pretty slick and is easy to use--just drag-and-drop images onto it. It also keeps a searchable list of images you've uploaded in the past for quick access and has a cool template function that makes it easy to get HTML or forum codes (or any other format you want) for a single image or a whole bunch. ImageBot seems to have a little trouble with really big images (and error messages can be frustratingly vague), but uploading them a few at a time seems to help.