Lately, I've become a fan of Kathy Sierra, not even knowing that she was speaking at SXSWi. Her website makes great use of graphics, as well as words. Her writing in the Head First series is engaging and interactive. How do we make our applications, our content, our subject matter so compelling that our readers stay with us, through the "suck threshold" as she's dubbed it.
Interestingly enough, you almost have to listen to the podcast as you look at her blog entry because she uses so many visuals.