I second Ben's recommendation for How to Think Straight about Psychology from last month.

Shadowplayers: The Rise And Fall of Factory Records by James Nice (who is also military history writer James Hayward). A history of the Factory Records label, by the man who's reissued large chunks of its catalogue over the past twenty years. A marvellous story if Manchester post-punk sounds like the sort of thing you'd be interested in. I have to go through it and redigest large chunks of it into Wikipedia. This is unduly difficult as for once in my life I've bought the physical paper item and it's a five hundred page brick, but at least I can use page numbers in the references.

Culture Shock, entertaining, though unfinished crossover between Harry Potter and Iain M. Banks' Culture, via r/hpmor.

I have a lot of great stories to recommend, and I tried to get a wide sampling of genres and authors. In no particular order: Inviolate - A fiction of the DC Universe. Novel length. Complete. The base conceit is basically, "what would happen if Lex Luthor went sane?" It's a little bit like watching MoR Quirrell fight the entire DCU... with SCIENCE. The same author also writes Variant Strain, which is a Spiderman/Prototype story, novel length, ongoing. It's a very clever mix of the two source materials, and has a great deal of inside references to the Marvel universe while being mainly a retelling of a game with clever concepts and a pretty lousy plotline. Fair Vote - A fiction of the Dresden Files, novel length. It's very interesting in that it's almost completely unrelated to any of the main characters in any of Jim Butcher's novels; everything in the book is almost entirely Original Content - which means that it's a great read both for fans of the series and for people who have never read a bit of it. The lack of connection to existing characters means that most people don't happen to stumble across this one - I think it has sixteen reviews in total, last time I checked. Definitely a fic which could use more recognition. In Flight - A fiction of Fate Stay Night and Sekirei, novel length. Ongoing. I saw that Fate/Stay Night was mentioned in last month's thread; this is probably one of the best known fics including elements from it. Because it's a crossover fic, it does a lot of explaining setting elements, which makes it a pretty okay entry point into the series if you don't mind a few spoilers. It's action packed, and very, very funny. If you prefer a story without all the crossover and with a little less humor, you might want to try From Fake Dreams, which is a fairly well written variant of the 'time travel makes a character awesome' trope. The Road To Cydonia A Ranma / X-COM fic. Trilogy length. Ongoing, but slow to update. Further crossovers with DCU throu

Read the City Watch series and I highly recommend.

Charlie Stross' Laundry series, all of it. It's great. Rollicking spy novels about the world where Lovecraft is true. Very readable and enjoyable.

Flash game: Socrates Jones: Pro Philosopher. The gameplay is similar to Phoenix Wright: Ace Attorney, but you instead debate famous philosophers in an attempt to understand morality. It's pretty short and suffers from the "I know the correct answer here, but how did the author of the game intend me to indicate that" problem, but I found it fun and interesting nonetheless. It helps to keep the walkthrough at hand, so you can resort to it if you start getting frustrated. Even though the arguments were only addressed relatively briefly, I actually felt like I'd learned something. Liked the music, too.