I haven't really cottoned onto ereaders as such*, but I found that having a smart(enough) phone with an app really converted me just about overnight. Do I have my phone with me == do I have eleventymillion books/stories with me and the opportunity for more (unless the train's in a tunnel).

* I commute on the bus and the train, carrying a laptop, lunch, water, snack, coffee, iPod, and phone with me. I strongly resist carrying *anything else* if I don't have to.