Like other publishing houses, PopCap will discount their iOS games in order to raise money for Japan Earthquake relief. Here are the titles:
Bejeweled
Bookworm
Chuzzle
Peggle
Plants vs. Zombies
Escape Rosecliff Island
That last one, Escape Rosecliff Island, might not be on sale, but it’s still $4, which is pretty cheap. [Kotaku]