Here's an interesting article from O'Reilly on the state of the computer book market according to their publishing and sales figures.
From a Flash Platform developer's point of view it is exciting to see that ActionScript has moved into the top tier of programming languages, selling enough titles to make it part of the 'Large' languages. The growth of the ActionScript bracket is also very good, in fact it is one of the three fastest growing languages in that category next to C# and PHP.

Way to go Flash!