The very reason I started reading eBooks was because of the backlight
I work late so I get home when the family is asleep and the wife gets rather annoyed with even the most subtle little light.
I always have a hard time falling asleep so I really need to read a bit in bed just to get settled in. The Nokia E90 was the first piece of electronic I read on. With the colors on magenta (background and silver/grey (letters) I could read for a long time without it bothering my eyes. On my N900 I dim the screen but the black letters on yellow backlight isn't as easy on the eyes as the E90 was. Also the small screen isn't as good.
So I have high hopes for the Pandora as a reading device. Hopefully I can change the colors of the ePub reader to be as easy on the eyes as on my E90 and with the screen size I certainly win. Would be great in a bus too!