A year with an Amazon Kindle
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It just doesn't work for technical books (why that's probably a good thing -- I'll cover in a minute). No monospace font, but also, you read tech books a lot faster than normal text. Pages fly by when they've got code in them (most code in these books are API/language based, which means you usually just care about identifiers), and that hits one of the big weaknesses of the kindle:
Page flip time.
When you're reading a novel or other all-human-text book, the page flip time is barely noticeable, as your eyes are moving to the top-left at the same time. However, if you're scanning a book for a specific section or mention of an identifier, it'll kill you with its slowness.
However, if you're like me and read a lot of technical books, this isn't such a bad thing. The kindle's a great way to get in on reading nontech books, which adds a good dimension to a geek's life. There are mailing lists where publishers give you a new ebook a month, to get you into new authors/genres of sci-fi.
Plenty of 'regular books': novels, biographies, newspapers, etc. It's a wonderful way to richen your life, with amazon's recommendation engine & a good selection of books.
My friend has a sony eReader, and his device is a much nicer piece of hardware. But I win in selection, hands-down. He mostly just reads PDFs on his now, usually datasheets or the like.
As for cases, the original works decently for me. I also just don't care that much about cases -- anything to protect the hardware sufficiently without getting in my way is fine. If you play with the case a bit (a little physical-world hacking), you can make it stay on the device pretty well.
I'm afraid that the lack of a monospace font on the kindle means that I will absolutely not be buying one, as a lot of the books I would want to carry on it would be technical reference type of stuff.
Disclaimer: I haven't bought a single book from the Kindle store since I've bought the device (around 6 months). The primary reason I got it was to reduce eye-strain. Most of what I read on the Kindle is technical PDFs converted using Mobipocket's free software. But it doesn't produce the same results. The Sony Reader can display native PDFs, but because most PDFs aren't built for a small screen, it's almost as inconvenient.
I use the Sony Reader which is a lot slimmer with better build quality than the Kindle. I heard good things about the iLiad which would be better if you want a bigger device, keyboard etc.
The real mark against the Kindle is the DRM. It's basically the iTunes choice all over again except worse as the device can't play anything not bought from there. If your not technically literate you might want to trade control for ease of use but if your on Hackers News your really should be buying the device you can hack.
I agree about the Sony Reader though, much prettier. Although I don't actually use mine at all, too much effort to find and format free books and the real thing is so easy to get and very convenient.
I'm in the UK though, if I was in the US the wireless book store thing on the Kindle would probably interest me.
I'm more interested on whether Amazon having a monopoly on the hardware/distribution could allow them to dictate the payment model for example they could continue pay-per-book whereas customers normally prefer subscription based models.
This is already a fairly dysfunctional market where the vast majority of books are out-of-print and will never enter the public domain. There's also some question about what happens to public libraries.
About the sony reader did you use libprs500 (now called calibre) to do the conversion for you? It works on Linux and autoconverts everything I've thrown at it.
Personally I use it for reading trashy SF that I wouldn't otherwise buy (I'd feel like I was wasting paper if nothing else). BAEN is a practically unlimited source of the stuff.