I'd like to be able to save posts to a "draft" folder (like you might find in an email program), so they could be completed or posted at a later date. I sometimes start a post and then find I need to research part of my reply, or I get interrupted, and I'd like to be able to click a "save for later" link, which I could access when it was convenient.

I often have half-written posts in an open browser window for hours at a time, or partially written posts saved in text files on my desktop. A draft folder would be a better solution.