No real e-book readers have a back light. Backlight cuases eyestrain, so instead they use e-ink. This makes them much, much easier to read on a bright sunny day though. If you need a light at night, you can use a clip on light.
The Kindle 1 has an SD slot, but the Kindle 2 does not. You don't really need it as it holds 1500 books and archives ALL your Amazon books for you for re-download as needed.
Newer books you'll have to get from Amazon. You can get older books from any site that offers e-books without DRM (though some may need converted first). For public domain books I recommend Project Gutenberg or Manybooks.net. I think they're both formatting better than Google books.
No real e-book readers have a back light. Backlight cuases eyestrain, so instead they use e-ink. This makes them much, much easier to read on a bright sunny day though. If you need a light at night, you can use a clip on light.
The Kindle 1 has an SD slot, but the Kindle 2 does not. You don't really need it as it holds 1500 books and archives ALL your Amazon books for you for re-download as needed.
You need this light to use the Kindle for reading in the dark, it doesn't have backlight:
http://www.amazon.com/review/RV3IIPVW8NO6W?ie=UTF8&ref_=cm_cr_rdp_perm
It doesn't have SD card, but 2GB internal memory. And you just need to get the books directly from Amazon.
Does it have a backlight?
The Kindle does not have backlight for easy reading with your eyes. Read here and you'll know:
http://www.amazon.com/gp/tagging/tag/kindle/forum?ie=UTF8&cdForum=Fx1D7SY3BVSESG&ref_=cm_cd_ef_tft_tp&cdThread=Tx164P1YL79AI6U
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you can find more than ten thousand free books for the Kindle. So no need to go to library to borrow them, you can actually own them:
http://www.gutenberg.org/wiki/Main_Page
http://manybooks.net/
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Review written by a person who has tried Amazon Kindle, Sony Reader, and some other ebook readers. It is also the best review I've ever read about ebook readers:
Soul of the e-reader; Kindle 2 gets closer to delivering the promise., February 23, 2009
http://www.amazon.com/review/R3QM7LGL62MZ4X?ie=UTF8&ref_=cm_cr_rdp_perm
The Dinosaur & the Kindle, May 6, 2009
http://www.amazon.com/review/R9J54TZ1541OR?ie=UTF8&ref_=cm_cr_rdp_perm