Word has it that upcoming PS3 exclusive Ryu Ga Gotoku 3 requires, like a lot of PS3 games do these days, a mandatory install. Sign of the times!
Apparently, the install will be 5120 MB (5GB). So those living in Japan who plan on buying the game next month, make sure you've got the extra space or be very, very sad. Just like these children.
Mandatory install confirmed for Yakuza 3 [PS3center]