Feel free to add a comment with additional websites where people are talking about the game.
Supercell's Official Clash of Clans Forum
This is the official forum hosted by Supercell, the company that created Clash of Clans.
Clash of Clans on Facebook
Supercell maintains a Facebook page for Clash of Clans. This is where they announce contests, new features, and upcoming updates.
Clash of Clans on Twitter
Clash of Clans is also on Twitter! If you are on Twitter then join:
Clash of Clans on Reddit
This is the subreddit dedicated to Clash of Clans maintaned by Flammmy.
Clash of Clans Community Blog
Uncensored and unofficial.
Clash of Clans Builder
A web based tool where you can create, experiment with, and share village designs.
Clash of Clans Army Planner
A web based tool where you can plan different troop combinations and helps optimize the time it takes to build them.
Clash of Clans Troops and Spells Calculator
Troops and Spells Calculator with friendly user interface. Helps to calculate the cost of the attack in order to remain in plus, after the battle.
Clash of Clans Podcast
Want something to listen to in the morning, like a morning show or a radio? Check these guys out!
Clash of Clans Builder and Tips
A website with top layouts and good tips.