http://washingtonexaminer.com/news/.../kids-go-expensive-buying-sprees-iphone-games

"The Smurfs' Village," a game for the iPhone and other Apple gadgets,
was released a month ago and quickly became the highest-grossing
application in the iTunes store. Yet it's free to download.
So where does the money come from? Kelly Rummelhart of Gridley, Calif.,
has part of the answer. Her 4-year-old son was using her iPad to play
the game and racked up $66.88 in charges on her credit card without
knowing what he was doing.
Rummelhart had no idea that it was possible to buy things buy them
with real money inside the game. In this case, her son bought one
bushel and 11 buckets of "Smurfberries," tokens that speed up gameplay.
{SNIP}
"The Smurfs' Village," a game for the iPhone and other Apple gadgets,
was released a month ago and quickly became the highest-grossing
application in the iTunes store. Yet it's free to download.
So where does the money come from? Kelly Rummelhart of Gridley, Calif.,
has part of the answer. Her 4-year-old son was using her iPad to play
the game and racked up $66.88 in charges on her credit card without
knowing what he was doing.
Rummelhart had no idea that it was possible to buy things buy them
with real money inside the game. In this case, her son bought one
bushel and 11 buckets of "Smurfberries," tokens that speed up gameplay.
{SNIP}