Amazon Digital:

Sonic Generations - $14.99
Shogun 2: Total War - $14.99
Rome: Total War - $8.55
Bulletstorm - $8.72
Mount & Blade: Warband - $9.62

You can knock $5 off any of them with a coupon. Links have ref ids.

Edit: Also,

Assassin's Creed Revelations - $35.47

Last one doesn't accept $5 coupons.

Origin EU store:

The Sims sale
http://store.origin.com/store/eaemea/en_IE/html/pbPage.lovesimsIE2/

edit:

Bastion $7.49 on GameStop / Impulse ( DRM free version , non-Steam )

edit again: Bought the game . And thanks to the developer i now own the game on Steam too . :)

Amazon Digital deal of the day:
Battlefield Bad Company 2 Vietnam - $8.49

Can be knocked down to $3.5 with coupon. Not the best deal out there, but somebody might be interested. Link has ref.

"Indi Royale - Serious Sam Pack" available here: http://www.indieroyale.com/

I was surfing the web and I came across some good GameStop Coupons -
Save $15 off all orders!!!

It's worth noting that this bundle contains the OLD serious sam games and not the new "HD" ones. The way the publisher named the games is that the only difference between the old and new titles is "HD" which is easy to overlook if you're not familiar with the series.

Erm not quite..
"Coupon TEBO - Save $15 when you purchase 2 new in-stock games priced $59.99 or more. Excludes, select PC products, and DLC. Other Restrictions may apply. Expires 1/31"

I could not get this coupon code to work. The link on that site merely takes to the game stop (not impulse) home page and no discount is applied when you add an item to the cart.

edit: you got even further than I did mamusz because I couldn't find any code at all :-( using that site.

Steam Daily Deal is Titan Quest pack for 2.49 EUR

Must have for everyone!

GameStop / Impulse daily deal :

Two Worlds II $14.99
Two Worlds II - Pirates of the Flying Fortress $14.99

edit:
If you liked Plants vs Zombies grab Orczz for $2.99 ( use coupon code NEW299 , only valid for new customers )
http://www.bigfishgames.com/download-games/15977/orczz/index.html?src=frmgameimg&osdetect=true

$5 in Americabucks.

Damn I dont have enough euros to buy Titan Quest today. Anyone maybe have some coupon that can be used for it ( half off and I can get it )

Anyone have a Ubisoft coupon?

I second this, especially if you're a fan of hacn'n'slash games. Titan Quest has four great settings, well-suited game mechanics (especially with the expansion) and a good way of always giving some incentive to go on, gather better loot, gain more levels, and grind, grind, grind.

The game of its type I never felt like grinding (while I Was grinding). My favourite game of its type.