Overdrive Read: Platform agnostic and download free
If you are curious about new developments in eBook delivery, you'll want to see what Overdrive is working on. Overdrive is rolling out a new browser-based reading platform with no downloads required - similar to what Follett has done with FollettShelf.
(Just remember than none of these solutions is inexpensive!)
"Read eBooks instantly on almost any device - no apps, no software. Just you and your book with a single click.
Overdrive has also posted a handful of ebook previews (Book cover, Table of Contents and a chapter or so) on the open web. You can search their epub samples by using the "site:" command in Google.
For example, site:epub-sample.overdrive.com +young adult
This will bring up several Overdrive titles to preview in your browser window.
Freddy and the French Fries
All the Stars in the Sky