use my iPhone
I first started reading eBooks about 10 years ago and used a Palm back then. But when the iPhone came in I moved to that. I figured I carried it everywhere anyway, and with the iPhone I can read books I've bought from anywhere - or with Stanza, any I have on my computer.
I have an Android phone as we'll, so that's loaded up with all the different apps to assist with my reading - but I can't get Stanza for that, so I can only read from major sites. I've toyed with the idea of getting a dedicated ereader though and the Fire looks really interesting. You've gotta love Amazon!