While we're praising O'Reilly, I should mention Safari Books Online. I'm sure you've all seen the promotions for the service in any O'Reilly book you purchase. I'm a subscriber, and it's a great service. I get electronic access to almost every book in the O'Reilly library, plus books from a number of other tech publishers, all for a little over $20 a month ($45 if you want to get rid of the 10 books/month limit).
It's been great for when I need to review some new technology (e.g., HTML5) but don't want or need to read an entire book about the topic in question. And it works great on my Kindle. Also -- and I'm sure O'Reilly is aware of this -- when I find something particularly good on Safaribooksoline, I sometimes end up purchasing the "deadtree" version of such books so I can have a physical book to read when I'm away from the computer/Kindle.
1) I got some promotional mail for a new subscriber deal, and I asked if they could give me that deal too. In response they gave me a better deal and a free month.
2) I used my tokens to download what I thought was the latest edition of a book(2005, pdf only), but discovered a month later that there was a newer one just released(6yrs newer, epub and .mobi formats). I asked if there was anything they could do, and they refunded my tokens so I could get the new one. (They also gave me 200 extra tokens which they removed after I notified them. If it was a smaller qty I would have just assumed they were being nice and kept them, but 200 was pretty clearly an error.)
I'll second this, and add, I've purchased more books because of seeing and reading them on Safari Books Online then I think I would have otherwise. The wealth of knowledge available with a subscription is amazing.
It's been great for when I need to review some new technology (e.g., HTML5) but don't want or need to read an entire book about the topic in question. And it works great on my Kindle. Also -- and I'm sure O'Reilly is aware of this -- when I find something particularly good on Safaribooksoline, I sometimes end up purchasing the "deadtree" version of such books so I can have a physical book to read when I'm away from the computer/Kindle.