Beep Blip Games' Hungry Monsters is another cute, $US0.99 game. It wont cause any game design revolutions, but it looks charming nonetheless.
The goal in this game is to save as many monsters as possible by drawing lines to bounce them upwards and feed them before the enemy - lava - gets too high.
As you can tell, this kind of game is little more than a minigame in retail packages, but with a happy soundtrack, it's also the kind of thing that usually proves popular on the iPhone.
It features cute graphics to go with that music and simple, one-touch gameplay. Should be good for public transport, and keeping the young ones' quiet.