ThriftyNerd.com is a giving away a copy of Batman: Arkham City for PS3 or Xbox 360. Standard Twitter contest. Just tweet, "Win Batman: Arkham City from @ThriftyNerd by following and RT. http://thrif.de/mWNTmU #ThriftyCity"
Full details here - http://thrif.de/mWNTmU
ThriftyNerd.com is giving a copy of Ms. Splosion Man this week. It is a pretty simple Twitter contest, but instead of following a person on Twitter you need to become a fan of their Facebook page.
Full details can be found here.