This kindle vs. Nook comparison boils down to five main questions that you need to ask yourself before manufacture a purchase.

1. How much money do you want to spend?

Kindle

The Amazon kindle 3G costs - 9.00 - 9.00

The Barnes & Noble Nook Costs - 9.00 - 9.00

2. How large do you want your screen to be?

Kinde has a few options for you to select from:
6 Inches (Price - 9.00)
6 (3G model) comes with free 3G + WiFi (Price - 9.00)
9.7 inches (Dx Model) comes with free 3G and works globally (Price - 9.00)

Nook
Both versions of the Barnes & Noble Nook have a 6' diagonal display screen size

3. What's your screen preference? Backlit or e-ink?

kindle
With the kindle you can read everywhere together with outside in full sunlight because it has a high dissimilarity e-ink screen which is awesome.

Nook
The Nook also has an e-ink screen.

4. Do you want to have way to 3G wireless networks when using your e-reader?

Kindle
With the 9.00 model you can download Kindle books in seconds and also browse the web wherever you can get a WiFi signal using the Kindle browser.

The Kindle 3G model offers free 3G + WiFi and the Kindle Dx also offers free 3G plus it works globally.

Nook
The 9.99 model doesn't offer 3G Wireless but it does give you the potential to way WiFi at any At&T hotspot plus you can also way WiFi for free at any Barnes & Noble location.

The 9.00 model does offer 3G Wireless through At&T and you can also way WiFi everywhere else together with At&T hotspots plus Barnes and Noble locations.

5. Do you want to be able to way your books or data on other wireless devices.

Kindle
With the Kindle you can read your books everywhere and even way them on other devices like iphone, ipad, mac, pc, android phone or blackberry. It also has whispersync technology that syncs your place over devices so you never forget where you left off. Your books are also backed up online with your Kindle inventory so you never have to worry about loosing your data.

Nook
The Nook offers the same functionality and lets you share your books on other devices like the ipad, iphone, mac, pc and android phone. At this time the Nook doesn't offer any synchronized last page read technology like Kindle but on the Nook website it says 'coming soon' so that could convert any day...

Cool features comparison:

Text To Speech Reader
Kindle - Yes
Nook - No

Twitter & Facebook Integration (enables you to quickly share passages with friends online)
Kindle - Yes
Nook - No

Storage Capacity
Kindle - Holds up to 3,500 books
Nook - Holds up to 1,500 books

Battery Life
Kindle - Lasts up to one month with wireless turned off
Nook - Lasts up to 10 days with wireless turned off

Free books
Kindle offers over 1.8 million out of copyright pre 1923 books for you to download so if you're in the mood for reading a superior book during your day at the beach this is cool

Nook offers more than 500,000 free ebooks.

Low book prices
Kindle - Many books start at .99 or less together with best sellers
Nook - Same.

Kindle Vs Nook - An Honest Comparison of the Top E-Readers

Thanks To : Buy Kindle DX DSLR Lens | Best Buy & Review