JR Hill & Co. has begun offering new vinyl screen protectors for Apple’s iBook, PowerBook G3, and PowerBook G4. The screen protectors prevent the portable’s keyboard from rubbing against the screen when closed, which otherwise can leave marks behind. The iBook and PowerBook G3 screen protectors are available for US$6.99, while the PowerBook G4 version sells for $9.99. JR Hill & Co. also offer a full grain leather screen protector for the PowerBook G4 for $17.49.