I know that some of you are writers who have not yet been published, so I thought you might be interested in what line editing looks like circa 2012. Here I have reproduced the first two pages of the What Boys Really Want manuscript with line edits from David Levithan, and my responses. I love working this way, with lots of room for comments and changes. Sometimes a manuscript will go through several rounds of changes, with all of the interactions recorded.
(Click to enlarge)