I usually post my pictures through Photobucket. I always try to downsize them to 640 x 320 or so. They call that forum size. Sometimes I forget to re-size and they come out huge. I always go back and delete it and try again. I know what you mean by toooooooooooo big. Scrolling around to see the whole thing takes away from the viewing pleasure. Plus every post after that gets stretched out so you need to scroll to read the replies as well.
Size 'em down folks. Makes everybody happy!