Where to Play

1	realArcade GamePass RealOne Arcade offers player matching for several versions of Monopoly. They provide Monopoly 3, and other versions for free when you sign up for a free 30-day trial of their service.
2	Yahoo! Games Monopoly Yahoo! Games Monopoly by Parker Brothers. Offering multi-player matching.
3	Java Middopoly This is a java-based, monopoly clone available for free on the web. You can play with several players, however you must all share the same computer.
4	Oligopoly Multi-player (same location) web-based Java applet. Did I mention, it's in German
5	IRCopoly This is an Internet version of Monopoly that uses IRC chat for play. It's still in the early stages of development, but you can try their alpha if you're interested.
6	Case's Ladder Online Here you can play with Monopoly (version 1) CD -- Here you can only play with Version 1, and you need to be a member of the free league. You'll have to create an account (for free), log on, go into "Categories", then "Chat" under community.
7	Galactic Magnate This is free online monopoly, with some rules changed. It's a downloadable Windows client. Features online ranking system, nice graphics and simple interface. For 2-5 players.
8	Java Monopoly This is a java-based web game. You can only play a two-player game, and both must be at the same PC (or browsing the web together). Not for competition, but a decent game nonetheless, though the music is a bit cheezy.
9	Gamespy Arcade Here you can play with any CD Version of Monopoly. Gamespy Arcade offers lobbies and player matching for a variety of games, including two Monopoly lobbies one for version 1, the other hosting version 2 and 3. There, you can chat and play others over the web.