Too many times have I accidentally pressed a button and 3 paragraphs of writing has disappeared. I was thinking that there should be an undo and redo button, so that if somebody makes a big mistake, they can just undo it.

there is a workaround to this. If you are typing a post and delete something, press [ctrl]-[z]. If you have already submitted the post, hit back twice and you should be viewing a cached copy of the page.

Or if you expect it to happen all the time, Ctrl C everytime you type a paragraph.

And continuing on from above posts, hopefully your browser is set to Control+C to copy the highlighted text, and Control+Z to undo the past action. I'd suggest to find out though if a large number of Tip.Iters use those shortcuts for some thing else(Don't ask me what they could use it for, I have no idea), and if so, actually put in the button on the post page. :?

Ok thatnks, never thought of that.

Edit>Undo