Yes, I have rewritten my Hubs and posted them elsewhere. I always run them through Copyscape after each rewrite. It saves me from having to do the research over and over for posting in different places. I have found that I can get three or four articles or hubs using the same research notes before I get where I can not think of how to reword it. If you are trying to make the most of your time it makes sense to me to rewrite at least once and post elsewhere. Another thing I do is post backlinks to the original article where ever it is because it is related content and helps with SEO.