I entered a page title which contained some 'special' character, which was just a slash . I also entered some text for the page. I clicked preview, and it gave me an error page saying I can't use certain characters. There was no 're-edit' or 'back' link on this page. I clicked my browser's back button (the only possible thing I could do), and all the information was lost, forcing me to re-enter it all from memory. Ouch! That's totally lame. Slashes, and many of the other characters are quite common for titles of articles and also blogs.