So this is my kindle review that I PMed to KC.
I wanted to play with the kindle a while before I gave a review of it. First of all, it is absolutely fantastic. It only does one thing, but it does it superbly. I honestly could not be happier. I went with the wifi only version which is 8.5 ounces. Right now I have over 200 books on it, plus a few PDF files and it still has a ton of room.
I bought, but haven't yet received this neoprene case for it:
http://www.amazon.com/Neoprene-Kindle-S ... 35&sr=1-32
The case clocks in at 2.9 ounces, so between the kindle, the case and a ziplock bag its under 12 ounces for a limitless amount of books.
I've read 3 books on it over the last week and a half, and I still have close to 80% of the battery life left, so that won't be an issue. Battery life was the main reason (asides from weight and cost) that I didn't go with an ipad. However, like I previously said, the kindle only does one thing, and that is to read books. The interface is simple and easy to pick up. However, I will say that it took a minute to get used to not having a touch screen as I have grown accustomed to on my iphone. However, that is just a minor point.
Depending upon your moral compass, if you choose to download books off the torrent sites, they are compatible with the kindle (as long as it is a mobi format file) and it is as easy as dragging and dropping onto the kindle. A lot of people use this program to manage their books and convert formats:
http://calibre-ebook.com/
If you choose to pay for books off of amazon for the kindle, typically speaking the kindle versions are cheaper than the paper copies of the books. Also, there is a large variety of classic books that are free from amazon. I decided to reread "The Art of War" and it was a free download.
From a backpacking standpoint: its a winner, hands down. The battery life is excellent (also it will last longer if you turn off wifi and 3g) and the weight plus a case is light. It seems sturdy and rugged enough. I accidentally dropped mine from about 4 feet and it landed without any damage to the kindle. However, if you are thinking about scanning maps and putting them on the device, I don't think it would work that well. The screen really isn't large enough for maps, and it is in black and white only. However, you could fit plenty of trail guides and other books on it. A quick search on the kindle showed books on the john muir trail and PCT. I've had many days where I've been stuck in the tent due to rain, and this would be a lifesaver on those days. I haven't been on a trip yet with it, although (as long as the weather cooperates) I am trying to go out to Preston Falls in Stanislaus National Forest this weekend, so I can let you know how it performs in the field.
Anyways, sorry for the long post, but I hadn't seen a review on amazon that addressed it for backpacking. All things considered it is an excellent device that I couldnt be happier with.