Top thread banner contributed by Xieneus. OP that is below worked on by the many past OPs of previous TF2GC threads, with ideas and artwork from General Chatters like you.
Latest update: on 9/27/12, includes other Source engine games
Latest blog post: 9/11/12, "Halloween is Only Fifty Days Away!"
TF2 Website- Updates and News from the TF2 Team.
TF2 Wiki - Everything you need to know about TF2 in one place.
TF2 Backpack Explorer - Detailed backpack viewer.
TF2B - Faster backpack browsing.
TF2 Items - Comes with loadout info, item and backpack history.
OPTF2 - One of the fancier backpack viewers, shows almost anything you'd want to know.
TF2 Outpost - Trading site.
TF2TP - Another trading site
TF2 Bazaar - Yet, another trading site.
TF2WH - You can trade stuff for credits and trade credits for stuff.
Chris's TF2 Configs - If you can't run TF2 very well or you just want to see the maximum quality possible on TF2 without making it explode.
Meet the Stats - Various statistics on items, their qualities and other interesting information.
TF2 Gallery - See screenshots from TF2 of hats with different paints and effects.
TF2LS - Lists all the items you have, you haven't and in which quality you can find it.
TF2 Raffle House - Free raffle site.
TF2 Scrap - Scrapbanking bots. Also with reverse scrapbanking.
TF2 Tags - Post your ideas for named items, descriptions, or paints on hats or weapons.
TF2 Toolbox - Some tools for managing your backpack.
[h2]Past Threads (Category Banner (still) WIP):[/h2]
V1: the original
V2: 100% More Generic!
V3: Early thread lock
V4: Hats and Class
V5!!: Exclamation marks are cool edition!!!!
V6: I have never made a thread edition
V7: February 2012 Edition
V8/vMarch: Not TF2 General Chat
V9/April: TGITF2 General Chat and Other Topics
V10/May: TF2 General chat and everything that isn't TF2
V11/May: Director's Cut Edition
V12: v. TF2 Chat
Alternate V12: v. Shitposts galore
V13: v. Seiteki makes all the threads.
V14: (And Friends) General Chat - Now with more teamplay
V15: Seiteki will steal my OP
V16: & Main Headquarters - Shoot Many Robots
V17: The only thread in the Team Fortress 2 forum where we only discuss Call of Duty
V18: First Rule of TF2 General Chat? Do not talk about TF2. (you are here)