Harry, I'm surprised it took until post #9 for you to pop in this thread and shill the Cybook.
Also, note that the Cybook, like the Kindle, has limited availability (currently out of stock), which is an issue for the OP.
OP: Many (OK, most!) books are not available for either the Reader or the Kindle, like the Harry Potter books. There are a lot of options out there for books. The choice of resources depends on what you're looking for.
There's a sticky thread in the Reader Content forum called "Sony Reader book sources beyond CONNECT" that's worth checking out. I've found tons of free books online as well as buying many. Places like Baen free library (for sf), manybooks.net (with a mix of stuff), and silkpagoda.com (selling a $10 DVD with over 10,000 classic books--the 'Blackmask' collection--in Reader format, well worth the price!) are all out there. Plus you can load any rtf or Word/text doc on the Reader. The Reader Content forum here, with a ton of resources for converting ebook formats, is awesome.
Overall, I've found a ton of books to read on my Reader, including classics, some familiar authors, some new authors (including many espionage/political thriller books), and some new genres (the cyberfiction, much of which is available at manybooks--Cory Doctorow, Charles Stross, etc.).
My approach to reading isn't "I want this book by this specific author right now." If that's your approach to reading, an ebook device may not be for you because most books are simply not available in electronic form. Just like in a bookstore, I look at what's available and pick out books that seem interesting (and quickly get absorbed by them!). It's a bonus that so many of them happen to be free.
