I say this as a technophile generally - those of you who have seen through the tears in the cloak of anonymity will know I do "computers" for a living. (Well, not really a living, but I'm not quite dead yet.)
I have never been the
remotest bit interested in electronic books. I like reading and although I have precious little time for it, I much prefer to turning real physical pages to viewing on a screen. So I was not really able or ready to offer any insight into ebook devices. I can tell you that Amazon publishes Kindle ebooks in a particular format that is not immediately compatible with other devices. Other devices use other formats for their publications. There are different sources of both free and paid-for content for both systems.
I know Mrs S's uncle has a kindle, which is good for him because he has had brain surgery and so he has concentration problems and loses his place a lot, and the matt screen is helpful for him not to be distracted with glare, plus he can hold it easily, magnify areas and generally feel more comfortable with reading again than he can do with a book nowadays. I cannot say what the other devices are like, but despite the situation which suits my uncle-in-law, I was
still not interested in ebooks.
However. For my birthday I got a new phone - it's an HTC Desire Z, with Android as an operating system. (Think iPhone but not made by Apple and not tied to the closed system. On the iPhone "there's an app for that" but what many people don't know is that Android also has a huge collection of apps.)
So I downloaded a Kindle app for the Android.
AND I downloaded an alternative ebook reader called Laputa. I deleted Laputa after I
ALSO downloaded CoolReader, which is another (of many) free apps for reading ebook content. With those two apps on my HTC I know have a very nice small screen reader, which between them can handle pretty much any format of ebook I want to bother finding - of which I have discovered a lot of free stuff, and many things of the sort that "I really
would like to read (or reread), but would never have gone and bought, or sought out at the library." There is also plenty of content to buy, as well, often at cheaper prices than the paper versions (because the distributors don't have the printing and binding, storage, transport and retail shelf space to pay for).
While trying to massage the book formats into one or the other, I also downloaded a PC version of the Kindle reader. What is interesting about that is that when you source your ebooks from the Amazon Kindle Store, you can sync it with whichever reader you are using at the time. So you can have a physical Kindle device, a mobile phone app on your Android or iPhone, etc. and a computer app on your desktop pc, and your laptop, and they will all have a copy of the ebooks which you can read, and it will know the place where you have got up to when you finished reading last, whichever method you were using to read. What is
MORE interesting though is that I also found a free program called Calibre which can convert (non DRM encoded) publications from one format to another. So epub formats can be converted to mobi for reading on a Kindle, and mobi formats can be converted to epub for reading on other devices (or dozens of other formats).
So, you can probably tell that (although I would still
prefer reading a "book" with real paper pages) I am happily ready to recommend ebook devices generally, and - given the subjective anecdotal reasons of my uncle-in-law's use, and the fact that there is lots and lots of content "out there" that can be downloaded in Kindle format
or converted to Kindle format, as well as the stuff that comes from the Kindle store too, I would probably be inclined to suggest a Kindle is the most convenient actual device, were I to actually go and purchase one. Which I'm not. So I'm not really qualified to make any recommendations, and I certainly don't have any experience with any other devices which would make me suggest that you shouldn't buy one of them instead.
Inside the Amazon Kindle Store you can browse the free classic collections, and the main source I know for free ebook content is
http://www.gutenberg.org/wiki/Main_Page but there are lots of others if you search, such as Feedbooks.com, Manybooks.net and smashwords.com
If you find any books that you can download for free, but are not sure if they will work with whatever reader you have, then let me know and I will show you what you (or I, if you get really stuck) can do with Calibre.