NOTE - I was recently shown this by a friend who knows that I typically LOATHE all fanfic. However, this is really well done, quite amusing, and doesn't waste my time with crappy fetish nonsense. The podcasters have gone to some trouble to produce a fairly professional production here. The book is not finished - it seems to have been in weekly installments for some time - but here it is as of August, 2013. Links to the original and updates below. My only changes were to clean up the tags a little.

Rambam1776

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http://hpmor.com/

This is a mirror of Less Wrong‘s / Eliezer Yudkowsky‘s epic Harry Potter fanfic-in-progress, Harry Potter and the Methods of Rationality, produced with the consent and at the request of the author. There’s an rss feed for this mirror which updates within an hour of a new chapter being added, and hpmor.com/latest should always point to the most recent chapter. (This last could lead to spoilers if, as sometimes happens, two or more chapters are uploaded at once, so I do recommend using the Table of Contents or RSS feed.)

Petunia married a biochemist, and Harry grew up reading science and science fiction. Then came the Hogwarts letter, and a world of intriguing new possibilities to exploit. And new friends, like Hermione, and Professor McGonagall, and Professor Quirrell... 

Disclaimer: J. K. Rowling owns Harry Potter, and no one owns the methods of rationality.

This fic is widely considered to have really hit its stride starting at around Chapter 5. If you still don't like it after Chapter 10, give up.

Please visit HPMOR DOT COM for:

* Easy email notification system, RSS feed, and Twitter feed for new chapters;
* Current Author's Notes and progress updates;
* Lovely fan-made book-style PDF version;
* Ad-free mirror of the text;
* ePUB and MOBI e-texts;
* Ongoing podcast of the story;
* Fan art in vast quantities;
* Cameo list (characters named after fan artists);
* Fan-fanfiction of this fanfiction;
* Fan music, songs, and animations;
* Fan translations;
* The OKCupid keyword for HPMOR readers;
* Links to TV Tropes page and discussion forum;
* Trigger warnings page (warnings about possible traumatic associations for some readers; to avoid spoilers for most readers, there are no warnings inside the main story);
* How to learn everything the main character knows;
* Open job positions at a related nonprofit;
* And ever so much more.

Reviews make me happy. You can leave reviews on any chapter, no login required, and there's no need to finish reading it all before you start reviewing chapters - but do please leave at most one review per chapter.

This is not a strict single-point-of-departure fic - there exists a primary point of departure, at some point in the past, but also other alterations. The best term I've heard for this fic is "parallel universe".

The text contains many clues: obvious clues, not-so-obvious clues, truly obscure hints which I was shocked to see some readers successfully decode, and massive evidence left out in plain sight. This is a rationalist story; its mysteries are solvable, and meant to be solved.

The pacing of the story is that of serial fiction, i.e., that of a TV show running for a predetermined number of seasons, whose episodes are individually plotted but with an overall arc building to a final conclusion.

The story has been corrected to British English up to Ch. 17, and further Britpicking is currently in progress (see the /HPMOR subreddit).

All science mentioned is real science. But please keep in mind that, beyond the realm of science, the views of the characters may not be those of the author. Not everything the protagonist does is a lesson in wisdom, and advice offered by darker characters may be untrustworthy or dangerously double-edged.