Monopoly and Other Game Websites
Google Monopoly - Directory of websites, human-edited. They pull this info from DMOZ. But their version is kinda neat because it includes that nifty PageRank info.
Yahoo Monopoly - Also a human-edited directory of Monopoly websites. Some people pay $299 just to have an editor review their site for this directory. Anyone willing to spend $299 just to have their site reviewed must be serious about their website.
Wikipedia Monopoly - Volunteer-written encyclopedia article about the game. Since anyone can edit this article at any time, the level of quality can vary. At the time of this writing, it's definitely a nice big page though.
Official Monopoly Site at Hasbro - Official site.
Durango Bill's - Monopoly probabilities analyzed.
Monopoly Collector - Game history and facts along with photos of the owner's collection.
Monopoly Lexicon - More stuff for collectors all over the world.
Probabilities in the Game of Monopoly - Long term probabilities of landing on each square, expected income per roll per square and per property, other calculations, and conclusions. Quite detailed and insightful.
PSMonopoly - Guide to where you can play free Monopoly online.
Richard Wilding's Monopoly Collection - Looks like it hasn't been updated since 1999, but it's still a neat site from someone who obviously loves the game.
Who Invented Monopoly - Fascinating history of the game and the controversy regarding who actually should get credit for inventing Monopoly.
Other Games Related to Finance and Economics
Ratrace Players - Features a searchable database of Cashflow 101 players. (That's the game by the Rich Dad, Poor Dad dude.)
General Gaming Sites
Boardgame Geek - THE website about boardgames. No one else comes close to having the breadth and depth of coverage on the subject. Bookmark this one.
Board Game Central - The other authority site on boardgames.
The Game Pile - Mostly focused on board games. They also feature a section focused on games put out by NBC.
The Great Games of Sid Sackson - If you ever wanted to read about Sid Sackson's games, well, you'd be hard-pressed to find a better website than this one.
Dan Becker's Home Page - Lots of cool stuff about board games and miniatures.
The Game Cabinet - An online game magazine, but it hasn't been updated since 2000. Still has lots of great reviews though.
Game Report - A quarterly gaming magazine with a website. Last updated in 2005.
Board Gamers Anonymous - For lovers of German style boardgames.
49th West Games - A game manufacturing and publishing company, makers of Explorium.
Tripoley Rules - Neat little website about a cool card game that combines Hearts with Rummy and Poker.
Poker Vibe - Includes poker book reviews and strategy articles.
Yahoo Poker Guide - Information about Yahoo's online cardroom.
Craps information at playcraps.net - If you like to gamble, and you like adrenaline, then playing craps is the way to gamble.
Keno - Another gambling game, but lousy odds. Relaxing though, on the complete opposite side of the spectrum from craps.
Prison Struggle - A free, fun MMORPG where you take the role of a prisoner in a penitentiary.
American Darts - How to play darts, including rules, tournament play, and a free online darts game.
Football Babble - Explains football for people who don't really know anything about the subject. Good for wives.