So since the Autumn Seal deal post was closed due to being lazy crap, here's a forum thread to discuss and trade keys.
Autumn Seal is a free online slot machine game where you can win discount codes for games on Steam.
http://www.autumnseal.com/
You get 10 spins on your IP address. After 10 spins, you must wait 5 minutes for it to reset if you didn't win anything, 10 minutes if you did.
If you win, enter your email (or a temporary one if you're worried about spam) to be emailed a key. Register the key on Steam to have the coupon added to your Steam inventory. It appears the coupons only last about 7 days from when they're won or possible registered. They're also tradeable once registered. The coupon will be automatically applied when you go to check out one of the applicable games on the Steam store.
To use the code, download the Steam client from www.steamgames.com and install it. When you have created an account, start the client, log in, and in the lower-left corner click "Add a game" and choose "Activate a Product on Steam…" and enter the code.
Prizes include:
75% off Trine 1
75% off Trine 2
50% off Trine 2: Goblin Menace DLC
75% off Trine Complete Collection (Trine 1 + 2 + Goblin Menance DLC)
50% off Alan Wake Collector's Edition (Alan Wake + developer commentary video + PDF artbook + digital soundtrack
50% off Alan Wake's American Nightmare
75% off Rochard
50% off Legend of Grimrock
If you get 3 Alan Wake seals (flashlight seal), you can choose which of the two Alan Wake discounts to get. If you get 3 Trine seals (wizard hat), you can choose which of the 4 Trine discounts to get.
Keys up for grabs. Please leave a comment if you use one.
50% off Legend of Grimrock
HWGCT-JW34T-5YCJ9
XLM4V-46YTN-Y8RTW
LRWEC-3ABCN-E2P50
M7R3M-GTH46-Y0H8Q
75% off Rochard
DP9CV-5AZ8W-W6CIX
DIIWW-N8MYF-BIVET
FHJE8-NFZEN-Z69X4
YP2A6-2TZLR-53DFA
YCWBL-PZIID-INZEN
I378V-2LA2B-Q2QPM
3L99D-G7WYM-XM2FG
75% off Trine Complete Collection
3Z9HV-KANHX-8DFLX
50% off Alan Wake Collector's Edition
9DMZ6-D787Y-74M2H
RKKNR-42E7F-4C9RT
50% off Alan Wake's American Nightmare
TWA7P-33P5Y-Q308A
Frozenbyte: -75% Trine Complete Collection Steam discount coupon
Key: K0H7Z-2B6V3-XJ7M2
Frozenbyte: -50% Trine 2: Goblin Menace Steam discount coupon
Key: N04WF-TIBI9-WZIK6