Apple's iBooks v1.5
You see, they implemented a night time reading theme, which works wonders. No longer does the iPad's backlight bathe you, and anyone near you, in its glow. The change, in essence, reverses the image: white type on a black backdrop rather than black type on a white (and ultra-bright) backdrop.
A few other changes: full screen and a greater variety of fonts.
I like the update. Download, and see for yourself.
-- David M Gordon / The Deipnosophist