http://www.steamgifts.com/giveaway/C6aKW/serious-sam-double-d

http://www.steamgifts.com/giveaway/C6aKW/serious-sam-double-d
<3

http://www.g-forums.net/general-discussion/4607-[contest]-defense-grid-awakening-dlc-10-steam-codes-giveaway.html

Zerg it to the forums: http://www.g-forums.net/general-discussion/4138-%5Bgforums-giveaway%5D-gundemonium-collection-10-steam-keys-giveaway.html

Gamegetter: http://getter.g-forums.net/
You can get the awesome game "Sequence" for quite cheap and if more people participate, it will get even cheaper.
Oh and new giveaway: http://www.g-forums.net/general-discussion/3924-%5Bgforums-giveaway%5D-six-video-games-giveaway.html