The popular web comic xkcd is coming out in book form. The book will contain 150-200 of the 500 comics and will be sold on the xkcd website (initially, at least). There is an article about the book in the New York Times.
Regular readers love the extra joke that appears on a mouse-over. The article addresses how this will appear in print.
One trick in transferring the material from online to print has been how to recreate the “title text” that comments on the strip when your cursor hovers over it.
“It’s not supposed to be a punch line, but hopefully if you didn’t laugh, you’ll laugh at this,” he said. The title text will appear where the tiny copyright notice would appear on a traditional strip.