I started reading on my Palm T/X, really by accident. The feature was there and the software included a free ebook and one day I was stuck in a waiting room and started reading. Eventually I decided I wanted a bigger screen.
I purchased a number of books in the pdb format, so I wanted something that would read that format.
I also checked out a lot of books from my library and read them on my laptop, so I wanted to continue doing that.
At this point I was torn between a netbook or a nook.
I read at night before bed, but on the weekends and on my lunchbreak, I read outside. I have a hard time reading the lcd screen in the sun, so I decided to go with the nook and just use a book light at night.