I don't know if the folks at Halfbrick just really believe in the whole Mayan prophecy thing and expect the world to end in the next couple of days, but if you head to the App Store on iOS right now, you'll be able to download all of Halfbrick's back catalogue for free. Yes == even the HD versions. Go! Hurry up!
Games like Monster Dash, and Age of Zombies -- games that usually cost a little more than your typical 99 cents are part of the deal. Some of these games haven't quite gotten the exposure that massive hits like Fruit Ninja and Jetpack Joyride have gotten, so this is as good a chance as any to go pick them up.
The offer ends after 24 hours, but kicked off late last night. You still should have enough time to pick them up. Go go go!