Talking about the Samsung units led to the following chain of thoughts...
I liked the touch screen of the units but the screen was too small to do any real drawing or note taking with it and as annoying as the split keyboard was, it was still the fastest text entry.
Even though text entry wasn't great, it was pretty good with Microsoft Reader as a book reader where I could also check email, web browse a bit and run some other things if I needed too.
The iPod touch took over most of those tasks but didn't have Microsoft Reader so I had find another format as most of my eBook reading was from Baen's Webscription but there are ebook apps to make up for the format change. They have some quirks but if you don't have really high expectations they do basically work.
And thinking of format change, Amazon has the Kindle app and that also works pretty well. I was also pleasantly surprised to find that there is a good deal of free content with Amazon Kindle. The easiest way to find that is to go to the genre you are interested in and then sort from lowest to highest price. While there are plenty of out of copyright books, some new books sneak in (probably to encourage you to get the rest of the series).