This second part of my report on the iPhone application marketplace covers the class of software that, while still falling squarely in the overall eReader category, is designed primarily for storing and managing documents. The primary distinctions between this class and the one covered in Part 1 are that the eReader apps discussed here:

1. Handle a wide variety of common file formats found in the workplace, rather than just text and proprietary eBook formats,
2. Don't include controls for customizing fonts,
3. Don't let users do full-text search on documents,
4. Have good embedded browsers and follow web links,
5. More easily let users move files to and from their iPhones, and
6. Typically let users organize and rename files and folders within their interface.

It still surprises me how rapidly this market is evolving, and that evolution makes keeping tabs on the capabilities of each application--and even on the entire set of applications--quite challenging. As I was finalizing this report, a new application in this class came to market that, it turns out, I've found to have among the very best features of any that came before. I have no doubt that many of the applications reviewed here will continue to be refined, rendering this snapshot fairly obsolete fairly quickly. But the observations here accurately reflect the current state of iPhone eReaders.

The iPhone application marketplace now offers a tantalizing variety of tools that can be used as eBook readers and file managers. As I concluded in the September 2008 report, "Without Even Trying, Apple's iPhone Takes the eBook Reader Sweepstakes," the iPhone and iPod Touch hardware finally enables truly practical eBooks, and the software now available for the iPhone platform just clinches the deal.

Having worked with the growing number of these applications since the first started appearing in June, I've concluded that the market is clearly divided into two major objectives:

• Applications designed primarily for reading text (books), and
• Applications designed primarily for storing and managing documents.

As I compiled notes and usability data on this group of applications, it became clear that trying to cover all 19 different applications for the iPhone that can server as e-document readers in one article (a 20th was released just as I was finalizing this report) would be a bit much--for me as well as for readers. As a result, this will be the first of two installments of the overall report. (Note: All of these applications, with one exception, work equally well on both the iPhone and iPod Touch. For simplicity and brevity, I'll use "iPhone" to refer to both devices going forward.)

This first part covers the following iPhone applications, which are primarily aimed at reading text and HTML documents:

1. Bookshelf
2. Bookz
3. Reader
4. Evernote
5. Instapaper
6. iSilo
7. ReaddleDocs
8. Stanza

The second installment will cover applications that specialize in enabling document repositories on the iPhone: Air Sharing, Annotater, Caravan, DataCase, File Magnet, Files, Folders, iStorage, Mobile Finder, TextGuru, and TouchFS.

Of course, PDF turned out to be not particularly well suited to small viewing screens, since publishers would have to make a special layout for the PDF version. And so, years went by, with talk of E-Ink, electrowetting, electronic paper, and other exotic technologies appearing to be on the verge of practicality.

What most of the would-be designers of eBook readers have seemingly failed to grasp, however, is that to replace paper books, eBooks must be nearly as light and portable as a paperback. They must work without cords, and be compatible companions to one's daily trip to the little boy's room. (I've honestly never met a woman who reads in the john, but it seems nearly all men do.) They must be able to accompany you to the beach, the pool, or the mountains. I'd really like something I could read while holding it in one hand, like I do a paperback. I don't want a reader that will break the bank, either. And most of all, an eBook reader needs to be comfortable to use in bed or in your favorite armchair.

Even today, with devices shrinking towards the ideal size and weight, nearly all fail to meet my needs for one reason or another. Quite surprisingly, one device has in fact replaced books for me, and it's not one I ever thought would or could. Because I had bought the device for another purpose entirely, this eBook reader has actually cost me nothing whatsoever.

This article covers five eBook reader devices, including two that are full-fledged personal computers serving as an eBook reader by way of third-party software, and another that is a multifunction "smart phone" with eBook reader capabilities. All five devices have strongly positive characteristics, and two of of them possess the full range that would allow them to serve as portable eBook readers for organizations that need access to technical and policy documentation. Even though I personally need a reader that's useful for novels and such, I'm evaluating these based on their utility as devices for storing and reading technical and other documentation rather than literature, each of which have quite different requirements for eBook reading.