Until now there has been no way to give people comment-only access to a document in Google Docs. That’s a problem because you may want feedback on a document without letting someone actually change it. According to this Google Docs blog post, Google Docs accounts will start gaining the option of sharing a document with people in such a way that all they can do is add a comment. You can even set public documents such that anyone can comment. With this change, Google Docs becomes an even more valuable collaboration tool — there’s almost no reason to mail Word documents around for comment any more. follow link
Type an em-dash on an iPhone
Typography and punctuation geeks rejoice! It's easy to type an em-dash on the iPhone's or iPod touch's virtual keyboard. To do so, tap the .?123 key to switch to the numeric keypad. Then touch and hold on the Hyphen key to reveal a pop-up strip showing an em-dash. Slide to the em-dash and release your finger.
Note that this basic trick works with many other keys on the virtual keyboard.
Google Docs Gains Comment-Only Access Option