Bestselling E-book Readers on the Market

When looking for an e-book reader four bestsellers come to mind: Amazon Kindle 2, Kindle DX, Barnes and Noble Nook, and the Sony PRS-700. This will be a quick comparison of how much bang you get for your buck.
Amazon Kindle 2:

- 6" display screen
- 2 week battery life (with wireless off)
- Ability to obtain free e-books through amazon
- New lower price
- Stores 1500 Books
- Supports various formats: AZW, TXT, Audible,, MP3, unprotected MOBI, PRC; through conversion: PDF, HTML, DOC, JPEG, GIF, PNG, BMP

Amazon DX

- 9.7" display screen
- 2 week battery life (with wireless off)
- Stores 3500 books
- Ability to obtain free e-books through amazon
- Higher Price
- Supports various formats: Kindle (AZW), PDF, TXT, Audible (formats 4, Audible Enhanced (AAX)), MP3, unprotected MOBI, PRC natively; HTML, DOC, RTF, JPEG, GIF, PNG, BMP

Barnes and Noble Nook

- 6" display screen
- 10 day battery life (with wireless off)
- Has a 2GB flash drive (around 1500 books)
- Has a fair price
- Supports various formats: PDF, EPUB, eReader, PDB, JPG, GIF, PNG, BMP, MP3

Sony PRS-700

- 6" display screen
- Battery life last for 7500 pages
- 512 MB memory card
- Higher price for the amount of features
- Supports various formats: BBeB (LRF/LRX), PDF, EPUB, TXT, RTF, JPG, BMP, GIF, PNG, MP3, AAC

Overall the Amazon Kindle 2 gives the best bang for your buck. It supports all the major formats, has a good battery life, and is the lowest price of all three e-readers.