I'm reading, and enjoying, the book Microtrends, by Mark Penn. It's copyright is 2007, so it is a couple years old.
In his chapter "Lon Attention Spanners" he makes the argument that attention spans are growing longer, rather than shorter.
From a reading perspective, he pointed to a couple of different things.
1. Magazines like Atlantic Monthly and Foreign Affairs - which focus on very long pieces - have actually increased circulation...Foreign Affairs by 13 percent from 2002 to 2005.
2. In 2005, the average best-seller was 100 pages longer than the average best seller in 1995, and that in 1995, the average best seller was 385 pages.
He also talks about the popularity of series fiction as evidence of sustained attention spans.
He also goes into other areas of popular culture, citing certain TV shows, the growth in popularity of puzzles, and other aspects of our lives.
Really, I have no point to all this...I read the chapter last night and it kind of stuck with me, and thought I'd share, as I found it interesting.