Most helpful gaming sites/channels?

[Zkuq]

I have a few additions:

• GG.deals for, you guessed it, deals!
• PSNProfiles and Exophase.com for tracking trophies (PSNProfiles) and achievements across platforms (Exophase.com)
• NexusMods for mods (I guess it's still the place, outside Steam Workshop?)

Not a site or a channel, but the SteamDB browser extension adds some useful features to the Steam web client, perhaps most notably some price history details under the price of a game.