Update 2015-03-21: I would now strongly recommend reading Rationality: From AI to Zombies over this. Though the blog posts I collected here are the starting point for that book, considerable work has gone into selecting and arranging the essays as well as adding thoughtful new material and useful material not in this collection. Only if you've already read that should you consider starting on this; you can always skip the essays you've already read.
This is all Eliezer's posts to Less Wrong up to the end of 2010 as an EPub. Can be read with Aldiko and other eBook readers, though you might have to jump through some hoops on the Kindle (haven't tried it). I shared it privately with a few friends in the past, but I thought it might be more generally useful. Highlights include that all the screwed-up Unicode is fixed AFAIK.
Update: have now made a MOBI for the Kindle too.
Updated 2011-08-13 17:20 BST: Now with images!
Caveat Lector: This ebook is very long.
Kindles are weird. I just thought "Huh, I've been reading this for a long time now, and I'm only 70% through. I wonder how long it is..." So I ran a word count; One Million words. I did some calculations. At the font size I read at, I get about 115 words per page. So 1,040,000 words covers 9043 pages. A paperback I picked off my shelf fits 386 pages in 2.6cm thickness, making a page 0.00674cm thick. So if this were a physical book it would be 9cm wide, 12cm tall, and 62cm thick.
If you put it down it would stand 2 feet tall. With my 70% bookmark six inches off the ground.
Don't be put off though, this book has easily held my interest so far. It is definitely worth the time to read. But don't expect to knock it out over a weekend.
One million! That is alot of words.
The following link has the word counts for a bunch of well known Novels and Series. No single book mentioned in the article is even close to a million words. http://electricliterature.com/infographic-word-counts-of-famous-books/
Notably "Les Miserable" and "War and Peace" are at approx 531,000 and 563,000 (the lengths of these works vary significantly by translation. W&P can be up to around 590K).