Last week I was out of town. Normally I carry both my iPad and my Kindle in this case.
Unfortunately, last week I thought I had already put them in the bag and left with an empty bag, so I was stuck with just my phone (thankfully, issybird was kind enough to temporarily take over my Book Club duties). Reading on the phone's Kindle app is fine for a doctor's office or something similar, but it's terrible for reading in bed at night. The app doesn't allow for variance in the light intensity, even when I turn the overall phone light down.