Whether you're spending time traveling over the holidays or looking to gift a digital book to a colleague, friend or family members, electronic book (e-book) readers and e-book reader applications ("apps") for smartphones and tablets are a great pick this time of year.
Rather than lugging around paperback or hardcover copies of hot new business books – such as Tony Hsieh's Delivering Happiness or Robert I. Sutton's Good Boss, Bad Boss-- you can carry many hundreds of e-books on your favourite digital device.
Other benefits of e-book readers and apps include wireless shopping 24/7, the ability to adjust font size, and with most products, the ability to tap a word to get a dictionary definition. Many can read digital newspapers and magazines, as well.
And so here's a look at a few of the biggest – and free – e-book reader apps for smartphones and tablets available today:
iBooks
Available for Apple iPhone, iPod touch and iPad, this free 16-megabyte app serves as a gateway to Apple's iBookstore, an online store that allows you to preview and purchase digital books via iTunes – and read it all from within the app.

Downloaded e-books appear on a digital bookshelf; simply tap the cover of the e-book you want to read and it opens to the page you left off on (or you can jump to a bookmark if you're sharing the e-book with someone else). Flip pages, virtually speaking, by simply swiping your finger across the screen.
Users can select the desired brightness (such as dimming when outside), search for a keyword or adjust font size, style and whether you prefer white or sepiatone for the page colour. New features of the iBook app include the ability to tap on a photo to view it in greater detail and play music or video if any e-books offer it. Don’t understand a word? Double-tap it for a definition. You can also highlight a word or add notes to it.

For a relatively new store the selection is decent – though it's less than what's offered by Amazon's Kindle and Google Books. Prices are about on par with other e-book stores (about $10 for a current best-seller and less for older titles). PDF performance has been recently improved, too, so you can smoothly read any of these digital documents.
Google Books
Google recently tossed its hat in the e-book reader app space with Google Books, a free download for Android and Apple's iOS devices (namely, iPhone, iPod touch, iPad).

With more than 3 million books available, Google Books offers a greater selection than Apple's iBooks and e-book reader apps (Kindle, Kobo, and so on), which includes contemporary New York Times bestsellers and free classics from the public domain. It should be noted you don't purchase content right from within the app as you do with Apple's iBooks. Rather, tapping on the "Get eBooks" tab opens up the Google eBookStore in your smartphone or tablet's web browser, which is where you'll select what to preview (sample chapters), read reviews or purchase.
Google Books has a couple of features not found in Apple's product, such as a night-reading mode (reversing the black text on a white background (shown below); also available on Kindle's app), an "About the Book" tab (to get a story synopsis, author and publisher info, number of pages, and more) and an option to view the original scanned pages before converted into digital text.

The app also has a number of convenient features found in most other apps: "flip" through pages like a book (you can turn this off if you don't love the effect); adjust text size, typeface and line space; search within a book; and the ability to pick up where you left off on another device.
On the flipside, however, Google Books is missing a few things, such as a bookmarking feature, plus, there's no way to highlight text, add notes or look up a dictionary definition of a word.
Google Books is a good -- but not flawless -- e-book reading app for digital bookworms, though improvements will likely roll out via downloadable upgrades over time, as with most other Google work-in-progress apps.
Other players, too
There are many other apps available to download and/or read e-books on smartphones and tablets.
Even if you don’t own an Amazon Kindle (from US $139) or Kobo eBook reader ($159), free apps can be downloaded for Android and iPhones, so that you can read all your purchased books on the device of your choosing. In fact, you can start reading an e-book on, say, your PC or Mac, and then continue on your smartphone or tablet, and then finish it off on the Kindle or Kobo itself (or vice-versa). In other words, once you sign into your account, the app remembers where you left off, which is a convenient feature.
There are other good independent – and free -- apps for reading books on mobile Apple devices, including Stanza, Free Books, Classics, and more – most of which link to free books from the public domain and read PDF, ePub, .txt and other files.
Unfortunately, the BlackBerry App World doesn't carry many e-book reader apps just yet, but hopefully this will change once the BlackBerry PlayBook tablet debuts in late February.
Marc Saltzman is one of North America's most recognized and trusted technology experts. Based in Toronto, Marc currently contributes to nearly 50 publications, has authored 14 books and is the host of CTV News Channel's "Tech Talk," CNN's "Tech Time" and Cineplex's "Gear Guide" (seen in movie theatres across Canada).
Any business-related books you'd recommend reading over the holiday break? Post it here.