I use to read on my iPod Touch, and that was pretty decent with Stanza. I did it as kind of a proof of concept before I took the plunge on a dedicated reader. Now I would say 95% of my reading is done on my PRS-505 (which had been my wife's before I got her a PRS-650). The rest of the time I read with Aldiko on my LG Optimus (Great budget smart phone by the way... my only complaint is I wish I had a larger screen
). The main reason I read on the Optimus? Usually because I forgot to bring the Sony with me to someplace I often read (most frequently the gym).
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Bill