Freebies are universally awesome, whether they're free samples of pizza bagels at the grocery store or great iPhone games. We've favorably reviewed both of these games, but you might as well just download both of these and give them a try for yourself while they're free.
Truckers Delight: Episode 1 - While Mobigame is likely best known for the controversy surrounding Edge [$2.99], they've also brought both Cross Fingers [$1.99 / Free] and Truckers Delight: Episode 1 [Free] to the App Store as well. Truckers Delight is an episodic iPhone game based on the not at all work safe video of the same name. In the game, you play as a trucker driving down a highway pursuing a blonde girl in a red corvette. Your truck is controlled by tilting, and along the way you'll need to run police, motorcycles, and many other vehicles off the road with the help of an array of increasingly odd and vulgar power-ups.
We liked Truckers Delight: Episode 1 quite a bit in our review, and really can't wait for the rest of the episodes in the series. The game does a great job of preserving the feel of retro racing games while providing a good difficulty curve that gets really exciting as you're just barely making it to the next checkpoint with one second to spare. Don't miss this game while it's free.
Luxor - Initially released in 2005, Luxor has lived a long life on many platforms including the Mac, PC, and several game consoles both through its initial release and subsequent sequels. The iPhone port is done well, and features gameplay similar to Puzzloop [$7.99 / Free] and many other marble shooting color matching games. Luxor has a bit of a notorious reputation on our forums due to the role that developer Mumbo Jumbo played in StoneLoops! of Jurassica's removal from the App Store, which explains the tsunami of negative reviews in iTunes despite the fact that the game is quite fun.
As mentioned when we first took a look at the game, Luxor is host to a heap of levels, power-ups, and achievements to inflate your Plus+ score. If you've been looking for a marble shooter, grab this one while it's free.