Harry Potter and the Methods of Rationality just got several fascinating updates

Worm by Wildbow is also very much worth a try: http://parahumans.wordpress.com/ Not a fan fiction, like HPMoR, but rather a lengthy novel about superheroes and supervillains that takes the subject seriously and with an incredible amount of inventiveness. It may sound lame, but just try it for a chapter or two.

Hmm... I wouldn't agree with the people in this thread hailing it as a great work of literature. The main character is a complete Mary Sue - somewhat like Ender, but, in my opinion, considerably worse, although it's been toned down a bit in the later chapters. But I only say that to counter those people - it's indeed a delightful and addictive read. The only problem is that it updates quite infrequently and is nowhere near done - I…

Also see this review: https://danluu.com/su3su2u1/hpmor :) And an interesting sequel: https://www.fanfiction.net/s/11174940/1/Significant-Digits

Somebody should print this out and send a copy to Bill Gates so he can put it on his '5 books to read this year' list!!! Highly recommended!