Link

iPad

iTouch

Kindle 2

Kindle DX

Nook

Reader Daily Edition PRS-900BC

Reader Touch PRS-600SC

Available

March (WiFi only) April (WiFi/3G)

Now

Now

Now

Now

Now

Now

Price

WiFi: $499-699 3G/WiFi: $629-829

$199/$299/$399

$189

$379

$149 WiFi
$199 WiFi and 3G

$299

$169

Size

.5 inches thick

4.3x2.4x.33 in. 

8 x 5.3 x 0.36 inches

10.4 x 7.2 x 0.38 inches

7.7 x 4.9 x 0.5 inches

8.13 x 4 x 19/32 inches

6.9 x 4.8 x .4 inches

Weight

1.5 lbs.

4 oz. 

10.2 oz.

18.9 oz.

12.1 oz.

12.75 oz.

10.1 oz

Screen Size

9.7 inches

3.5 in. 

6 inches

9.7 inches

6 inches

7.1 inches

6 in.

Display

Backlit IPS Color

Grayscale

Grayscale

Grayscale reading, color nav

Grayscale

Grayscale

Touchscreen/Rotate

Yes/Yes

Yes/Yes

No/Manual

No/Yes

Yes/No

Yes/Yes

Yes/?

Battery Life

11 hours

30 hrs audio; 6 hrs video

7 days with wireless Whispersync on

7 days with wireless Whispersync on

10 days

7 days with wireless on

2 weeks/6,800 (ePub) Continuous page turns; 7,500 (BBeB Book) Continuous page turns

Storage/Expandable

16GB; 32GB; 64GB/No

8 GB; 32 GB; 64 GB/No

2GB/No

4GB/No

2GB/Yes (microSD)

1.6GB/Yes (Memory Stick Duo/SD)

512 MB/Yes (~ 380MB Dual Memory Card Expansion Slots for Memory Stick PRO Duo™ and SD Card™ up to 16GB)

Input

Touchscreen/Soft keyboard (wireless keyboard available)

Touchscreen/virtual keyboard

Keyboard

Keyboard(kind of hard to use and "joystick" feature not as easy as touchscreen)

Virtual keyboard

Touchscreen/stylus/virtual keyboard

Touchscreen/stylus/virtual Keyboard 

Wireless/Bluetooth

3G through AT&T/WiFi3G plans: up to 250MB, $15; unlimited $30. No contract.

WiFi/Bluetooth

Units sold through Oct. 22, Sprint 3G; Now 3G/roaming through AT&T/NO

3G (Whispernet/AT&T)

3G (AT&T)/WiFi

3G (AT&T)/WiFi

No

International

No deals yet; 3G unlocked

3G Roaming (AT&T)

3G Roaming (AT&T)

No

No

No

Native Formats

EPUB; Audible; Kindle (through app); iTunes;additional formats NA

EPUB; Audible; Kindle (through app); B&N Nook (through app); other ebook readers like Stanza; etc

Kindle (AZW), TXT, Audible (formats 4, Audible Enhanced (AAX), MP3, unprotected MOBI, PRC; Native PDF

Kindle (AZW), Native PDF, TXT, Audible (formats 4, Audible Enhanced (AAX), MP3, unprotected MOBI, PRC

EPUB, eReader, PDFs, MP3s, JPEG, GIF, PNG and BMP.

EPUB, PDF, JPEG, BBeB, TXT, RTF, JPEG, PNG, GIF, BMP , MP3, AAC

EPUB, PDF, BBeB, TXT, RTF, Word, JPEG, PNG, GIF, BMP, MP3, AAC

Platform

Open to approved third-party developers

Open to approved third-party developers 

Closed now but SDK has been released for upcoming beta and store with approved third-party developers

Closed now but SDK has been released for upcoming beta and store with approved third-party developers

Closed

Closed to developers; open in terms of multi-format, non-DRM use.

Closed to developers; open in terms of multi-format, non-DRM use. 

Browser

Safari

Safari

Yes in U.S., Japan. NA in most countries.

Yes

No

No

No

Available Content

Number of iBookstore titles N/A; Kindle Store; iPhone apps

400,000-plus books, more than 130 newspapers & magazines, 8,000 blogs (Numbers vary internationally)

400,000-plus books, more than 130 newspapers & magazines, 8,000 blogs (Numbers vary internationally)

350,000 books for sale, public domain; about 30 newspapers, magazines. Google Books brings titles to 1 million

Includes public domain, access to public libraries through OverDrive

Includes public domain, access to public libraries through OverDrive

Bookstore

iBookstore

iBookstore 

The Kindle Store

The Kindle Store

Barnes and Noble eBookstore, Google Books

Sony eBook Reader Store (converting to EPUB this year), Google Books

Sony eBook Reader Store (converting to EPUB this year), Google Books 

Book Sharing

N/A

Between devices, Kindle apps on same acct.

Between devices on same acct.

14 days on many titles

No

No

Microphone/Speakers

Yes/Yes

Yes/No

No/Yes

No/Yes

No/Yes

No/Yes

No/No

Archive

Apple

Apple

Amazon

Amazon

Barnes & Noble

Sony

Sony

Annotation

Y

Y

Highlighting

Ease of movement between books

Formatting and page locations/ease of citation

Individual registration/sign in

Resizeable fonts

Y

Y

Screen Resolution

480 x 320 pixels (163 ppi); 

600 × 800 pixels (167 ppi) 

825 × 1200 pixels (150 ppi) 

600 × 800 pixels (167 ppi) 

600 x 1024 pixels

600 × 800 pixels

Shades

16

16

16

16

8

Integrated Dictionary

Y

Y

Y

Y

Y

Y

User-replaceable battery

N

N

Y

Y?

Y?

Directory Organization Capability

Y

Text-to-Speech/Accessibility

Y

Y

N

Operating System

Mac iPhone/Touch

Mac iPhone/Touch

Linux

Linux

Android/Linux

Montavista Linux

Montavista Linux

Springer ebooks and articles

Elsevier ebooks and articles 

Google Books and Scholar

Internet Archive

CUL collections

Ebrary

My iLibrary

NetLibrary

Books 24/7/Safari

Overall Rating