Of course, we can already read e-books with other devices, including our laptop computers, iPods, iPhones and some other cell phones, and PDAs. But Amazon is hoping that Kindle's lighter weight than a laptop and larger, clearer screen than on smaller devices, will make us prefer to read books on Kindle.
Bible versions which are available so far for reading on Kindle are KJV, NIV, TNIV, The Word on the Street, and Young's Literal. But expect to see the ESV available for Kindle very soon, since the Crossway blog and technology team is keen on using the latest technology to promote the ESV.
Kindle can accept documents transferred from your computer in popular formats such as Microsoft Word, PDF, etc. So any Bible version, such as ISV and NET, already available for download in those formats, may be readable on Kindle.
UPDATE: Michael Hyatt, President of Thomas Nelson Publishers, describes how computer-to-Kindle document sharing works:
You can put your own documents on Kindle. And, contrary to many reports on the net, I was able to add PDF documents with no trouble. You simply email the documents as attachments to your Kindle.com email address. Amazon converts the document to their proprietary format and sends it to your Kindle. They charge 10 cents for each document. Alternatively, Amazon will return it to the email you address you sent the document from and you can load it on the Kindle yourself via the USB connection. (I haven't tried this.)UPDATE: Rick Mansfield notes in a comment what others have said, including Sean Boisen of Blogos, on whose blog I first learned of Kindle, that the price of Kindle is high, $400. That's too high for the general book-reading public (or is that now an oxymoron?!). But its price and the price of look-alikes will come down if there is enough demand for them, just as the price of the iPhone dropped soon after it was released.