Disclaimer and full disclosure: I work for Amazon when I'm not answering Askville questions and I love the Kindle.
We have three Sony "Reader Digital Book" PRS-500s and two Kindles in the house. For many reasons, the Kindles are in much greater demand. However, you've asked specifically about book selection, so here you go:
You buy books for the Sony on a PC from
ebookstore.sony.com where you can browse available titles.
You buy books for the Kindle directly on the Kindle. If you want to browse the books available for the Kindle before (or after) you get a Kindle, you can go to amazon.com's
kindle bookstore.
There are significantly more books available for the Kindle than there are for the Sony.
The Sony comes with a desktop application that you install on a Windows PC. From there, it does a good job of connecting to its online selection of books at the ebookstore.sony.com. These are the only books you can buy to read directly for the eReader, though you can also transfer PDFs, text files, and BBeB files to the reader.
The Kindle does not require a PC to buy books as it connects wirelessly to the Kindle store. You can also subscribe to newspapers and magazines and email documents and pictures to the Kindle. You also get direct, free, access to Wikipedia.org from the Kindle.
Having bought books in both ways, I can say that it's amazing how much more enjoyable the process of buying books is on the Kindle. When I finish a book on vacation, or at a coffee shop, or even at home, it's extremely nice to look for another book in the same genre or by the same author and then buy it, download, and start reading it in 2 minutes on the Kindle, without leaving my chair.
I hope this helps.
George
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