Dominion

Inventory
Components (Rio Grande Games standard edition): 500 Cards: 130 Basic Treasure Cards: 60 "Copper" Cards 40 "Silver" Cards 30 "Gold" Cards 48 Basic Victory Cards: 24 "Estate" Cards 12 "Duchy" Cards 12 "Province" Cards 252 Kingdom Cards: 240 Kingdom Action Cards (10 x 24 Each) 12 Kingdom Victory Cards (12 x 1 "Gardens") 30 Curse Cards 33 Placeholder/"Randomizer" Cards 7 Blank Cards Storage Tray Rulebook

5+ Player Rules
"To play with more than 4 players, the rules for Intrigue (link - page 7) give the following guidelines: Of course you'll need 3 more Estates per player at the beginning of the game, but for the Coppers you'll just have fewer in the supply. All other rules are the same as in a 3- or 4-player game. Keep in mind that more players can make a game feel slower, and can make some cards (especially attack cards) more powerful than in a smaller game. Also, Intrigue is the only "expansion" that comes with the common (Copper, Silver, Gold, Estate, Duchy, Province, Curse) cards, but once you have it you can use those to boost your supply. Until then I recommend using a few unused Kingdom cards to fill in the blanks. Between the Base set, Seaside and Alchemy I found I had at least fifteen blank cards, which my wife lovingly inscribed with appropriate verbiage to reduce our need for unused Kingdom cards."
 * Provinces = players x 3
 * Curses = (players - 1) x 10
 * Exhaust 4 Kingdom piles (instead of 3) to end the game. Province pile still ends the game on its own.

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"The official rules for 5-6 players in Dominion is outlined in the Dominion: Intrigue rulebook, as it requires the extra treasure and Province cards included with that expansion.


 * The following are rules for a single game accommodating 5 or 6 players. Please note that there will be increased downtime with 5 or 6 players, so this is not recommended for new players.


 * To set up for 5 or 6 players, combine the Treasure cards from Dominion and Dominion: Intrigue. Use 15 Provinces in the Supply for a 5-player game and 18 Provinces in the Supply for a 6-player game. All other Victory card piles (Estates, Duchies, and Victory Kingdom cards) remain at 12 cards per pile. Use 40 Curse cards for a 5-player game and 50 Curse cards for a 6-player game.


 * In a 5 or 6 player game, the game ends at the end of any player’s turn when one of two conditions is met: the Supply pile of Province cards is empty OR any 4 Supply piles are empty

I would recommend using these rules with proxy cards for the extra treasures, Provinces and Curses if you don't have the Intrigue expansion.

The designer's advice for 7-8 players is to run two separate tables of 3-4p"

The full intrigue rules are available at http://boardgamegeek.com/filepage/45425/dominion-intrigue-rules-english-pdf

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"Watch out for any attacks. Most attack cards get more powerful as the number of players rises, and normally weak attacks like Thief, Pirate Ship and even Saboteur can become killers if you have five or six players. "

Zombie Version
Dominion Retheme (Zombie / Left 4 Dead style) | Dominion | BoardGameGeek - http://www.boardgamegeek.com/thread/361553/dominion-retheme-zombie-left-4-dead-style
 * The print ready pdf files can be found here: http://www.boardgamegeek.com/fileinfo/37598

The ABCs of Dominion
The ABCs of Dominion - http://www.oeey.com/2015/02/the-abcs-of-dominion.html

Official Rules
The offficial Rio Grande Games rules can be found here:

Base Game: http://www.riograndegames.com/uploads/Game/Game_278_gameRules.pdf

Intrigue: http://www.riograndegames.com//uploads/Game/Game_306_gameRules.pdf

Seaside: http://riograndegames.com/uploads/Game/Game_326_gameRules.pdf

Play Online
http://playdominion.com/

Expansions
What expansions should I get? | Dominion Strategy

An overview of each expansion:


 * Intrigue: The first expansion, and the most natural. Comes with another set of Treasure/Victory cards, allowing you to support multiple games and/or a 5-6p game (though 5-6p games of Dominion are generally not that much fun).  Focuses on interaction and card choices.


 * Seaside: Focused on duration cards, which last between turns. Along with Prosperity, has probably the most powerful Action cards.


 * Alchemy: Introduces Potions, a different kind of “currency”, and emphasizes Action chains, leading to much longer games. Probably not a great first expansion.


 * Prosperity: Adds Colonies and Platinums, and a lot of other over-the-top cards. Probably the most popular expansion, and certainly the most well-received.


 * Cornucopia: A small expansion that focuses on card variety. A more advanced set.


 * Hinterlands: Introduces cards that trigger when you gain or buy them. A more advanced set.


 * Dark Ages: The most complex set so far, with a big emphasis on card interactions. It introduces many new mechanics (including gaining from the trash).

Releases
Source: