Maybe not "rife," but there's a bunch. Very interesting article.
"WhatSong was started by myself back in 2008. I believed there lacked a website which truely helped users find music from movies. Since then we have grown into a comprehensive database, with over 1,200 movies, 15,000 artists and 30,000 songs. Our main mission is to make this site the most helpful and comprehensive site for discovering songs you heard in movies."
It also has some songs from TV and video games.
"Fantasy football has been infiltrated by a 'shark and fish' system that crushes most people's chances"
Free online course offered by MIT Sloan School of Management.
This course takes a broad-based look at poker theory and applications of poker analytics to investment management and trading.
One tip I don't recall seeing elsewhere: later in the game, try to stay in jail. (How?)
Related: "You Don’t Hate Monopoly, You Just Suck at It".
Free on Amazon Kindle (at least as of yesterday, July 3).
This chess book has SIMPLE one-move-capture chess puzzles for kids and beginners.
This book is for players just learning chess, rated under 1000, that are still missing simple one move chess tactics involving hanging pieces.
Link courtesy of Michael Greenspan.
"Million-Dollar Hobby: Inside the World of Big-Money Bridge".
"Turning Tricks: The Rise and Fall of Contract Bridge".
"The Super Bowl of the Mind: Is quiz bowl the ultimate test of smarts or an overblown game of Trivial Pursuit?"
I vote for "somewhere in between".